| From | Andi Kleen <> | Subject | [PATCH] [3/223] block: limit vec count in bio_kmalloc() and bio_alloc_map_data() | Date | Mon, 13 Dec 2010 00:44:57 +0100 (CET) |
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2.6.35-longterm review patch. If anyone has any objections, please let me know.
------------------ From: Jens Axboe <jaxboe@fusionio.com>
commit f3f63c1c28bc861a931fac283b5bc3585efb8967 upstream.
Reported-by: Dan Rosenberg <drosenberg@vsecurity.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Andi Kleen <ak@linux.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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