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mpt2sas: Use compat_ptr to setup the pointer compatibility.

PATCH In review Kashyap, Desai 1 participant 1 message Dec 16, 2009 SCSI

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Kashyap, Desai

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PATCH 5/10 mpt2sas: Use compat_ptr to setup the pointer compatibility.

On ppc64, an 32bit application was failing due to data buffers not being copied properly from user to kernel memory. The problem due to improper conversion of 32 to 64 bit pointers. The fix is to use compat_ptr to setup the pointer compatibility in the routine _ctl_compat_mpt_command.

Signed-off-by Kashyap Desai <[email protected]>
Reviewed-by Eric Moore <[email protected]>

---

drivers/scsi/mpt2sas/mpt2sas_base.h +0 -0
drivers/scsi/mpt2sas/mpt2sas_ctl.c +4 -8
index 198ecdd..fa9bf83 100644
@@ -2203,14 +2203,10 @@ _ctl_compat_mpt_command(struct file *file, unsigned cmd, unsigned long arg)
 	karg.data_out_size = karg32.data_out_size;
 	karg.max_sense_bytes = karg32.max_sense_bytes;
 	karg.data_sge_offset = karg32.data_sge_offset;
-	memcpy(&karg.reply_frame_buf_ptr, &karg32.reply_frame_buf_ptr,
-	    sizeof(uint32_t));
-	memcpy(&karg.data_in_buf_ptr, &karg32.data_in_buf_ptr,
-	    sizeof(uint32_t));
-	memcpy(&karg.data_out_buf_ptr, &karg32.data_out_buf_ptr,
-	    sizeof(uint32_t));
-	memcpy(&karg.sense_data_ptr, &karg32.sense_data_ptr,
-	    sizeof(uint32_t));
+	karg.reply_frame_buf_ptr = compat_ptr(karg32.reply_frame_buf_ptr);
+	karg.data_in_buf_ptr = compat_ptr(karg32.data_in_buf_ptr);
+	karg.data_out_buf_ptr = compat_ptr(karg32.data_out_buf_ptr);
+	karg.sense_data_ptr = compat_ptr(karg32.sense_data_ptr);
 	state = (file->f_flags & O_NONBLOCK) ? NON_BLOCKING : BLOCKING;
 	return _ctl_do_mpt_command(ioc, karg, &uarg->mf, state);
 }