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Btrfs: fix potential use-after-free for cloned bio

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[ Upstream commit a967efb30b ]

KASAN reports that there is a use-after-free case of bio in btrfs_map_bio.

If we need to submit IOs to several disks at a time, the original bio
would get cloned and mapped to the destination disk, but we really should
use the original bio instead of a cloned bio to do the sanity check
because cloned bios are likely to be freed by its endio.

Reported-by: Diego <diegocg@gmail.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Liu Bo
2017-04-10 12:36:26 -07:00
committed by Greg Kroah-Hartman
parent c17acd24c6
commit 26899ca9cc
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/volumes.c
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@@ -6226,7 +6226,7 @@ int btrfs_map_bio(struct btrfs_root *root, struct bio *bio,
for (dev_nr = 0; dev_nr < total_devs; dev_nr++) {
dev = bbio->stripes[dev_nr].dev;
if (!dev || !dev->bdev ||
(bio_op(bio) == REQ_OP_WRITE && !dev->writeable)) {
(bio_op(first_bio) == REQ_OP_WRITE && !dev->writeable)) {
bbio_error(bbio, first_bio, logical);
continue;
}