several returns before unlocking in lmc_ioctl

PATCH In review Roel Kluin 2 participants 5 messages Oct 23, 2007 – Oct 30, 2007 Network drivers

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Roel Kluin

author

2007-10-23 00:59 UTC #0 lore raw

PATCH 1/1 several returns before unlocking in lmc_ioctl

Several returns before unlocking in lmc_ioctl

Signed-off-by Roel Kluin <[email protected]>

---

drivers/net/wan/lmc/lmc_main.c +36 ~~-23~~

index 5ea8772..af7b3e4 100644
@@ -142,9 +142,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
          * To date internally, just copy this out to the user.
          */
     case LMCIOCGINFO: /*fold01*/
-        if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof (lmc_ctl_t)))
-            return -EFAULT;
-        ret = 0;
+	if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof(lmc_ctl_t)))
+		ret = -EFAULT;
+	else
+		ret = 0;
         break;
 
     case LMCIOCSINFO: /*fold01*/

@@ -159,8 +160,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
             break;
         }
 
-        if (copy_from_user(&ctl, ifr->ifr_data, sizeof (lmc_ctl_t)))
-            return -EFAULT;
+	if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
+		ret = -EFAULT;
+		break;
+	}
 
         sc->lmc_media->set_status (sc, &ctl);

@@ -190,8 +193,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 		break;
 	    }
 
-	    if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u_int16_t)))
-                return -EFAULT;
+	    if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u_int16_t))) {
+		ret = -EFAULT;
+		break;
+	    }
 
             
 	    if (new_type == old_type)

@@ -229,9 +234,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
         sc->lmc_xinfo.Magic1 = 0xDEADBEEF;
 
         if (copy_to_user(ifr->ifr_data, &sc->lmc_xinfo,
-                         sizeof (struct lmc_xinfo)))
-            return -EFAULT;
-        ret = 0;
+					sizeof(struct lmc_xinfo))) {
+		ret = -EFAULT;
+	else
+		ret = 0;
 
         break;

@@ -262,9 +268,9 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 
         if (copy_to_user(ifr->ifr_data, &sc->stats,
                          sizeof (struct lmc_statistics)))
-            return -EFAULT;
-
-        ret = 0;
+		ret = -EFAULT;
+	else
+		ret = 0;
         break;
 
     case LMCIOCCLEARLMCSTATS: /*fold01*/

@@ -292,8 +298,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
             break;
         }
 
-        if (copy_from_user(&ctl, ifr->ifr_data, sizeof (lmc_ctl_t)))
-            return -EFAULT;
+	if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
+		ret = -EFAULT;
+		break;
+	}
         sc->lmc_media->set_circuit_type(sc, ctl.circuit_type);
         sc->ictl.circuit_type = ctl.circuit_type;
         ret = 0;

@@ -318,12 +326,15 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 
 #ifdef DEBUG
     case LMCIOCDUMPEVENTLOG:
-        if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof (u32)))
-            return -EFAULT;
+	if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof(u32))) {
+		ret = -EFAULT;
+		break;
+	}
         if (copy_to_user(ifr->ifr_data + sizeof (u32), lmcEventLogBuf, sizeof (lmcEventLogBuf)))
-            return -EFAULT;
+		ret = -EFAULT;
+	else
+		ret = 0;
 
-        ret = 0;
         break;
 #endif /* end ifdef _DBG_EVENTLOG */
     case LMCIOCT1CONTROL: /*fold01*/

@@ -346,8 +357,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
              */
             netif_stop_queue(dev);
 
-            if (copy_from_user(&xc, ifr->ifr_data, sizeof (struct lmc_xilinx_control)))
-                return -EFAULT;
+	if (copy_from_user(&xc, ifr->ifr_data, sizeof(struct lmc_xilinx_control))) {
+		ret = -EFAULT;
+		break;
+	}
             switch(xc.command){
             case lmc_xilinx_reset: /*fold02*/
                 {

@@ -618,8 +631,8 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
     }
 
     spin_unlock_irqrestore(&sc->lmc_lock, flags); /*fold01*/
-
-    lmc_trace(dev, "lmc_ioctl out");
+    if (ret >= 0)
+	lmc_trace(dev, "lmc_ioctl out");
 
     return ret;
 }

Roel Kluin

author

2007-10-23 01:47 UTC #1 lore raw

I think we should keep the lmc_tracing. Use this patch instead.

--
Several returns before unlocking in lmc_ioctl

Signed-off-by Roel Kluin <[email protected]>

---

drivers/net/wan/lmc/lmc_main.c +34 ~~-21~~

index 5ea8772..64eb578 100644
@@ -142,9 +142,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
          * To date internally, just copy this out to the user.
          */
     case LMCIOCGINFO: /*fold01*/
-        if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof (lmc_ctl_t)))
-            return -EFAULT;
-        ret = 0;
+	if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof(lmc_ctl_t)))
+		ret = -EFAULT;
+	else
+		ret = 0;
         break;
 
     case LMCIOCSINFO: /*fold01*/

@@ -159,8 +160,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
             break;
         }
 
-        if (copy_from_user(&ctl, ifr->ifr_data, sizeof (lmc_ctl_t)))
-            return -EFAULT;
+	if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
+		ret = -EFAULT;
+		break;
+	}
 
         sc->lmc_media->set_status (sc, &ctl);

@@ -190,8 +193,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 		break;
 	    }
 
-	    if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u_int16_t)))
-                return -EFAULT;
+	    if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u_int16_t))) {
+		ret = -EFAULT;
+		break;
+	    }
 
             
 	    if (new_type == old_type)

@@ -229,9 +234,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
         sc->lmc_xinfo.Magic1 = 0xDEADBEEF;
 
         if (copy_to_user(ifr->ifr_data, &sc->lmc_xinfo,
-                         sizeof (struct lmc_xinfo)))
-            return -EFAULT;
-        ret = 0;
+					sizeof(struct lmc_xinfo))) {
+		ret = -EFAULT;
+	else
+		ret = 0;
 
         break;

@@ -262,9 +268,9 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 
         if (copy_to_user(ifr->ifr_data, &sc->stats,
                          sizeof (struct lmc_statistics)))
-            return -EFAULT;
-
-        ret = 0;
+		ret = -EFAULT;
+	else
+		ret = 0;
         break;
 
     case LMCIOCCLEARLMCSTATS: /*fold01*/

@@ -292,8 +298,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
             break;
         }
 
-        if (copy_from_user(&ctl, ifr->ifr_data, sizeof (lmc_ctl_t)))
-            return -EFAULT;
+	if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
+		ret = -EFAULT;
+		break;
+	}
         sc->lmc_media->set_circuit_type(sc, ctl.circuit_type);
         sc->ictl.circuit_type = ctl.circuit_type;
         ret = 0;

@@ -318,12 +326,15 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 
 #ifdef DEBUG
     case LMCIOCDUMPEVENTLOG:
-        if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof (u32)))
-            return -EFAULT;
+	if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof(u32))) {
+		ret = -EFAULT;
+		break;
+	}
         if (copy_to_user(ifr->ifr_data + sizeof (u32), lmcEventLogBuf, sizeof (lmcEventLogBuf)))
-            return -EFAULT;
+		ret = -EFAULT;
+	else
+		ret = 0;
 
-        ret = 0;
         break;
 #endif /* end ifdef _DBG_EVENTLOG */
     case LMCIOCT1CONTROL: /*fold01*/

@@ -346,8 +357,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
              */
             netif_stop_queue(dev);
 
-            if (copy_from_user(&xc, ifr->ifr_data, sizeof (struct lmc_xilinx_control)))
-                return -EFAULT;
+	if (copy_from_user(&xc, ifr->ifr_data, sizeof(struct lmc_xilinx_control))) {
+		ret = -EFAULT;
+		break;
+	}
             switch(xc.command){
             case lmc_xilinx_reset: /*fold02*/
                 {

Kristof Provost

2007-10-30 18:35 UTC #2 lore raw

Quoted 9 lines · Roel Kluin

I think we should keep the lmc_tracing. Use this patch instead.
--
Several returns before unlocking in lmc_ioctl
Signed-off-by Roel Kluin <[email protected]>
---
drivers/net/wan/lmc/lmc_main.c +0 -0
index 5ea8772..64eb578 100644

<snip>

drivers/net/wan/lmc/lmc_main.c int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/ · line 240

Quoted 11 lines

drivers/net/wan/lmc/lmc_main.c +4 -3

@@ -229,9 +234,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
         sc->lmc_xinfo.Magic1 = 0xDEADBEEF;
 
         if (copy_to_user(ifr->ifr_data, &sc->lmc_xinfo,
-                         sizeof (struct lmc_xinfo)))
-            return -EFAULT;
-        ret = 0;
+					sizeof(struct lmc_xinfo))) {
+		ret = -EFAULT;
+	else
+		ret = 0;

I think you have an extra curly brace there. It breaks compile on my system.

Kristof

Roel Kluin

author

2007-10-30 19:15 UTC #3 lore raw

Quoted 14 lines · Kristof Provost

Quoted 9 lines · Roel Kluin
I think we should keep the lmc_tracing. Use this patch instead.
--
Several returns before unlocking in lmc_ioctl
Signed-off-by Roel Kluin <[email protected]>
---
drivers/net/wan/lmc/lmc_main.c +0 -0
index 5ea8772..64eb578 100644
<snip>
Quoted 3 lines
drivers/net/wan/lmc/lmc_main.c +0 -0
@@ -229,9 +234,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
         sc->lmc_xinfo.Magic1 = 0xDEADBEEF;
 

Quoted 10 lines

drivers/net/wan/lmc/lmc_main.c int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/ · line 240
Quoted 8 lines
drivers/net/wan/lmc/lmc_main.c +4 -3
         if (copy_to_user(ifr->ifr_data, &sc->lmc_xinfo,
-                         sizeof (struct lmc_xinfo)))
-            return -EFAULT;
-        ret = 0;
+					sizeof(struct lmc_xinfo))) {
+		ret = -EFAULT;
+	else
+		ret = 0;
I think you have an extra curly brace there. It breaks compile on my system.

You are right. thanks for notifying me and sorry for the trouble. please revert my patch (b463d40cdc436a12799a60a1d6ff1941a70a5bb6)

and try instead:
--
Several returns before unlocking in lmc_ioctl

Signed-off-by Roel Kluin <[email protected]>

---

drivers/net/wan/lmc/lmc_main.c +34 ~~-21~~

index 5ea8772..427226d 100644
@@ -142,9 +142,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
          * To date internally, just copy this out to the user.
          */
     case LMCIOCGINFO: /*fold01*/
-        if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof (lmc_ctl_t)))
-            return -EFAULT;
-        ret = 0;
+	if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof(lmc_ctl_t)))
+		ret = -EFAULT;
+	else
+		ret = 0;
         break;
 
     case LMCIOCSINFO: /*fold01*/

@@ -159,8 +160,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
             break;
         }
 
-        if (copy_from_user(&ctl, ifr->ifr_data, sizeof (lmc_ctl_t)))
-            return -EFAULT;
+	if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
+		ret = -EFAULT;
+		break;
+	}
 
         sc->lmc_media->set_status (sc, &ctl);

@@ -190,8 +193,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 		break;
 	    }
 
-	    if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u_int16_t)))
-                return -EFAULT;
+	    if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u_int16_t))) {
+		ret = -EFAULT;
+		break;
+	    }
 
             
 	    if (new_type == old_type)

@@ -229,9 +234,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
         sc->lmc_xinfo.Magic1 = 0xDEADBEEF;
 
         if (copy_to_user(ifr->ifr_data, &sc->lmc_xinfo,
-                         sizeof (struct lmc_xinfo)))
-            return -EFAULT;
-        ret = 0;
+					sizeof(struct lmc_xinfo)))
+		ret = -EFAULT;
+	else
+		ret = 0;
 
         break;

@@ -262,9 +268,9 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 
         if (copy_to_user(ifr->ifr_data, &sc->stats,
                          sizeof (struct lmc_statistics)))
-            return -EFAULT;
-
-        ret = 0;
+		ret = -EFAULT;
+	else
+		ret = 0;
         break;
 
     case LMCIOCCLEARLMCSTATS: /*fold01*/

@@ -292,8 +298,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
             break;
         }
 
-        if (copy_from_user(&ctl, ifr->ifr_data, sizeof (lmc_ctl_t)))
-            return -EFAULT;
+	if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
+		ret = -EFAULT;
+		break;
+	}
         sc->lmc_media->set_circuit_type(sc, ctl.circuit_type);
         sc->ictl.circuit_type = ctl.circuit_type;
         ret = 0;

@@ -318,12 +326,15 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
 
 #ifdef DEBUG
     case LMCIOCDUMPEVENTLOG:
-        if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof (u32)))
-            return -EFAULT;
+	if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof(u32))) {
+		ret = -EFAULT;
+		break;
+	}
         if (copy_to_user(ifr->ifr_data + sizeof (u32), lmcEventLogBuf, sizeof (lmcEventLogBuf)))
-            return -EFAULT;
+		ret = -EFAULT;
+	else
+		ret = 0;
 
-        ret = 0;
         break;
 #endif /* end ifdef _DBG_EVENTLOG */
     case LMCIOCT1CONTROL: /*fold01*/

@@ -346,8 +357,10 @@ int lmc_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
              */
             netif_stop_queue(dev);
 
-            if (copy_from_user(&xc, ifr->ifr_data, sizeof (struct lmc_xilinx_control)))
-                return -EFAULT;
+	if (copy_from_user(&xc, ifr->ifr_data, sizeof(struct lmc_xilinx_control))) {
+		ret = -EFAULT;
+		break;
+	}
             switch(xc.command){
             case lmc_xilinx_reset: /*fold02*/
                 {

Kristof Provost

2007-10-30 19:51 UTC #4 lore raw

Quoted 8 lines · Roel Kluin

Quoted 2 lines · Kristof Provost
I think you have an extra curly brace there. It breaks compile on my system.
You are right. thanks for notifying me and sorry for the trouble. please revert my patch (b463d40cdc436a12799a60a1d6ff1941a70a5bb6)
and try instead:

This seems to compile just fine. I'm afraid I can't test it though. I don't actually have that hardware. I mistakingly left it turned on, so I noticed the compile error.

Kristof