* [PATCH] Btrfs: fix potential use-after-free for cloned bio
@ 2017-04-10 19:36 Liu Bo
2017-04-11 11:47 ` David Sterba
0 siblings, 1 reply; 2+ messages in thread
From: Liu Bo @ 2017-04-10 19:36 UTC (permalink / raw)
To: linux-btrfs
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>
---
fs/btrfs/volumes.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 73d56ee..ab8a66d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6213,7 +6213,7 @@ int btrfs_map_bio(struct btrfs_fs_info *fs_info, 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;
}
--
2.5.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Btrfs: fix potential use-after-free for cloned bio
2017-04-10 19:36 [PATCH] Btrfs: fix potential use-after-free for cloned bio Liu Bo
@ 2017-04-11 11:47 ` David Sterba
0 siblings, 0 replies; 2+ messages in thread
From: David Sterba @ 2017-04-11 11:47 UTC (permalink / raw)
To: Liu Bo; +Cc: linux-btrfs
On Mon, Apr 10, 2017 at 12:36:26PM -0700, Liu Bo wrote:
> 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>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-04-10 19:36 [PATCH] Btrfs: fix potential use-after-free for cloned bio Liu Bo
2017-04-11 11:47 ` David Sterba
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