linux-kernel - [PATCH] [3/223] block: limit vec count in bio_kmalloc() and bio_alloc_map

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Date:	Mon, 13 Dec 2010 00:44:57 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	jaxboe@...ionio.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [3/223] block: limit vec count in bio_kmalloc() and bio_alloc_map_data()

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Jens Axboe <jaxboe@...ionio.com>

commit f3f63c1c28bc861a931fac283b5bc3585efb8967 upstream.

Reported-by: Dan Rosenberg <drosenberg@...curity.com>
Signed-off-by: Jens Axboe <jaxboe@...ionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/bio.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Index: linux/fs/bio.c
===================================================================
--- linux.orig/fs/bio.c
+++ linux/fs/bio.c
@@ -370,6 +370,9 @@ struct bio *bio_kmalloc(gfp_t gfp_mask,
 {
 	struct bio *bio;
 
+	if (nr_iovecs > UIO_MAXIOV)
+		return NULL;
+
 	bio = kmalloc(sizeof(struct bio) + nr_iovecs * sizeof(struct bio_vec),
 		      gfp_mask);
 	if (unlikely(!bio))
@@ -697,8 +700,12 @@ static void bio_free_map_data(struct bio
 static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count,
 					       gfp_t gfp_mask)
 {
-	struct bio_map_data *bmd = kmalloc(sizeof(*bmd), gfp_mask);
+	struct bio_map_data *bmd;
+
+	if (iov_count > UIO_MAXIOV)
+		return NULL;
 
+	bmd = kmalloc(sizeof(*bmd), gfp_mask);
 	if (!bmd)
 		return NULL;
 
--
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