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block: Limit request size (CVE-2014-0143)

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Limiting the size of a single request to INT_MAX not only fixes a
direct integer overflow in bdrv_check_request() (which would only
trigger bad behaviour with ridiculously huge images, as in close to
2^64 bytes), but can also prevent overflows in all block drivers.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2014-03-26 13:06:02 +01:00 committed by Stefan Hajnoczi
parent 1e7226f70c
commit 8f4754ede5
1 changed files with 4 additions and 0 deletions
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4
block.c
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@ -2588,6 +2588,10 @@ static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
int nb_sectors)
{
if (nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
return -EIO;
}
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE);
}