linux-kernel - [PATCH] lib/scatterlist: fix memory leak with scsi-mq

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Date:	Thu, 23 Oct 2014 15:10:21 -0400
From:	Tony Battersby <tonyb@...ernetics.com>
To:	linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Jens Axboe <axboe@...nel.dk>
CC:	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: [PATCH] lib/scatterlist: fix memory leak with scsi-mq

Fix a memory leak with scsi-mq triggered by commands with large data
transfer length.

Fixes: c53c6d6a68b1 ("scatterlist: allow chaining to preallocated chunks")
Cc: <stable@...r.kernel.org> # 3.17.x
Signed-off-by: Tony Battersby <tonyb@...ernetics.com>
---

For inclusion in 3.18 and 3.17.x.

--- a/lib/scatterlist.c	2014-10-23 13:32:27.000000000 -0400
+++ b/lib/scatterlist.c	2014-10-23 13:32:36.000000000 -0400
@@ -203,10 +203,10 @@ void __sg_free_table(struct sg_table *ta
 		}
 
 		table->orig_nents -= sg_size;
-		if (!skip_first_chunk) {
-			free_fn(sgl, alloc_size);
+		if (skip_first_chunk)
 			skip_first_chunk = false;
-		}
+		else
+			free_fn(sgl, alloc_size);
 		sgl = next;
 	}
 

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