Skip to contentSkip to conversation

FAILED: patch "[PATCH] staging: r8712: Fix memory leak in _r8712_init_xmit_priv()" failed to apply to 5.10-stable tree

PATCH [email protected] 1 participant 1 message Jul 31, 2023

Subsystems (2)
Stable branch Staging
lore
Share & tools
lore

[email protected]

author maintainer
#0 lore raw

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x ac83631230f77dda94154ed0ebfd368fc81c70a3
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2023073112-ice-reselect-6391@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

ac83631230f7 ("staging: r8712: Fix memory leak in _r8712_init_xmit_priv()") f179515da978 ("staging: rtl8712: Use constants from <linux/ieee80211.h>")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ac83631230f77dda94154ed0ebfd368fc81c70a3 Mon Sep 17 00:00:00 2001
From: Larry Finger <[email protected]>
Date: Fri, 14 Jul 2023 12:54:17 -0500
Subject: [PATCH] staging: r8712: Fix memory leak in _r8712_init_xmit_priv()

In the above mentioned routine, memory is allocated in several places. If the first succeeds and a later one fails, the routine will leak memory. This patch fixes commit 2865d42c78a9 ("staging: r8712u: Add the new driver to the mainline kernel"). A potential memory leak in r8712_xmit_resource_alloc() is also addressed.

Fixes 2865d42c78a9 ("staging: r8712u: Add the new driver to the mainline kernel")
Reported-by [email protected]
Closes https://syzkaller.appspot.com/x/log.txt?x=11ac3fa0a80000
Cc [email protected]
Cc Nam Cao <[email protected]>
Signed-off-by Larry Finger <[email protected]>
Reviewed-by Nam Cao <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here
Signed-off-by Greg Kroah-Hartman <[email protected]>
drivers/staging/rtl8712/rtl871x_xmit.c +34 -9
index 090345bad223..6353dbe554d3 100644
@@ -21,6 +21,7 @@
 #include "osdep_intf.h"
 #include "usb_ops.h"
 
+#include <linux/usb.h>
 #include <linux/ieee80211.h>
 
 static const u8 P802_1H_OUI[P80211_OUI_LEN] = {0x00, 0x00, 0xf8};

@@ -55,6 +56,7 @@ int _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
 	sint i;
 	struct xmit_buf *pxmitbuf;
 	struct xmit_frame *pxframe;
+	int j;
 
 	memset((unsigned char *)pxmitpriv, 0, sizeof(struct xmit_priv));
 	spin_lock_init(&pxmitpriv->lock);

@@ -117,11 +119,8 @@ int _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
 	_init_queue(&pxmitpriv->pending_xmitbuf_queue);
 	pxmitpriv->pallocated_xmitbuf =
 		kmalloc(NR_XMITBUFF * sizeof(struct xmit_buf) + 4, GFP_ATOMIC);
-	if (!pxmitpriv->pallocated_xmitbuf) {
-		kfree(pxmitpriv->pallocated_frame_buf);
-		pxmitpriv->pallocated_frame_buf = NULL;
-		return -ENOMEM;
-	}
+	if (!pxmitpriv->pallocated_xmitbuf)
+		goto clean_up_frame_buf;
 	pxmitpriv->pxmitbuf = pxmitpriv->pallocated_xmitbuf + 4 -
 			      ((addr_t)(pxmitpriv->pallocated_xmitbuf) & 3);
 	pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmitbuf;

@@ -129,13 +128,17 @@ int _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
 		INIT_LIST_HEAD(&pxmitbuf->list);
 		pxmitbuf->pallocated_buf =
 			kmalloc(MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ, GFP_ATOMIC);
-		if (!pxmitbuf->pallocated_buf)
-			return -ENOMEM;
+		if (!pxmitbuf->pallocated_buf) {
+			j = 0;
+			goto clean_up_alloc_buf;
+		}
 		pxmitbuf->pbuf = pxmitbuf->pallocated_buf + XMITBUF_ALIGN_SZ -
 				 ((addr_t) (pxmitbuf->pallocated_buf) &
 				 (XMITBUF_ALIGN_SZ - 1));
-		if (r8712_xmit_resource_alloc(padapter, pxmitbuf))
-			return -ENOMEM;
+		if (r8712_xmit_resource_alloc(padapter, pxmitbuf)) {
+			j = 1;
+			goto clean_up_alloc_buf;
+		}
 		list_add_tail(&pxmitbuf->list,
 				 &(pxmitpriv->free_xmitbuf_queue.queue));
 		pxmitbuf++;

@@ -146,6 +149,28 @@ int _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
 	init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
 	tasklet_setup(&pxmitpriv->xmit_tasklet, r8712_xmit_bh);
 	return 0;
+
+clean_up_alloc_buf:
+	if (j) {
+		/* failure happened in r8712_xmit_resource_alloc()
+		 * delete extra pxmitbuf->pallocated_buf
+		 */
+		kfree(pxmitbuf->pallocated_buf);
+	}
+	for (j = 0; j < i; j++) {
+		int k;
+
+		pxmitbuf--;			/* reset pointer */
+		kfree(pxmitbuf->pallocated_buf);
+		for (k = 0; k < 8; k++)		/* delete xmit urb's */
+			usb_free_urb(pxmitbuf->pxmit_urb[k]);
+	}
+	kfree(pxmitpriv->pallocated_xmitbuf);
+	pxmitpriv->pallocated_xmitbuf = NULL;
+clean_up_frame_buf:
+	kfree(pxmitpriv->pallocated_frame_buf);
+	pxmitpriv->pallocated_frame_buf = NULL;
+	return -ENOMEM;
 }
 
 void _free_xmit_priv(struct xmit_priv *pxmitpriv)
drivers/staging/rtl8712/xmit_linux.c +6 -0
index 132afbf49dde..ceb6b590b310 100644
@@ -112,6 +112,12 @@ int r8712_xmit_resource_alloc(struct _adapter *padapter,
 	for (i = 0; i < 8; i++) {
 		pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
 		if (!pxmitbuf->pxmit_urb[i]) {
+			int k;
+
+			for (k = i - 1; k >= 0; k--) {
+				/* handle allocation errors part way through loop */
+				usb_free_urb(pxmitbuf->pxmit_urb[k]);
+			}
 			netdev_err(padapter->pnetdev, "pxmitbuf->pxmit_urb[i] == NULL\n");
 			return -ENOMEM;
 		}