linux-kernel - [PATCH] aacraid: Remove mem leak in aac_send_raw

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Date:	Thu, 6 Jan 2011 21:26:45 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Adaptec OEM Raid Solutions <aacraid@...ptec.com>
cc:	"James E.J. Bottomley" <James.Bottomley@...e.de>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] aacraid: Remove mem leak in aac_send_raw_srb().


We leak in drivers/scsi/aacraid/commctrl.c::aac_send_raw_srb().

We allocate memory:
	...
			struct user_sgmap* usg;
			usg = kmalloc(actual_fibsize - sizeof(struct aac_srb)
			  + sizeof(struct sgmap), GFP_KERNEL);
and then neglect to free it:
	...
			for (i = 0; i < usg->count; i++) {
				u64 addr;
				void* p;
				if (usg->sg[i].count >
				    ((dev->adapter_info.options &
				     AAC_OPT_NEW_COMM) ?
				      (dev->scsi_host_ptr->max_sectors << 9) :
				      65536)) {
					rcode = -EINVAL;
					goto cleanup;
	... this 'goto' makes 'usg' go out of scope and leak the memory we 
	    allocated.
	    Other exits properly kfree(usg), it's just here it is 
	    neglected.


Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 commctrl.c |    1 +
 1 file changed, 1 insertion(+)

  Compile tested only, I don't have a way to test this properly, but I 
  think it's fairly obvious.

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 645ddd9..33370fb 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -649,6 +649,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 				     AAC_OPT_NEW_COMM) ?
 				      (dev->scsi_host_ptr->max_sectors << 9) :
 				      65536)) {
+					kfree(usg);
 					rcode = -EINVAL;
 					goto cleanup;
 				}



-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please.

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