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authorMike Snitzer <snitzer@redhat.com>2019-07-02 22:50:08 +0300
committerMike Snitzer <snitzer@redhat.com>2019-07-02 22:50:08 +0300
commit54fa16ee532705985e6c946da455856f18f63ee1 (patch)
tree5b019c4a77c281bb68e6d35f658e88b322c53beb /drivers/md/dm-thin-metadata.c
parent2eba4e640b2c4161e31ae20090a53ee02a518657 (diff)
downloadlinux-54fa16ee532705985e6c946da455856f18f63ee1.tar.xz
dm thin metadata: check if in fail_io mode when setting needs_check
Check if in fail_io mode at start of dm_pool_metadata_set_needs_check(). Otherwise dm_pool_metadata_set_needs_check()'s superblock_lock() can crash in dm_bm_write_lock() while accessing the block manager object that was previously destroyed as part of a failed dm_pool_abort_metadata() that ultimately set fail_io to begin with. Also, update DMERR() message to more accurately describe superblock_lock() failure. Cc: stable@vger.kernel.org Reported-by: Zdenek Kabelac <zkabelac@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-thin-metadata.c')
-rw-r--r--drivers/md/dm-thin-metadata.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index 7f0840601737..4c68a7b93d5e 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -2046,16 +2046,19 @@ int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd)
{
- int r;
+ int r = -EINVAL;
struct dm_block *sblock;
struct thin_disk_superblock *disk_super;
pmd_write_lock(pmd);
+ if (pmd->fail_io)
+ goto out;
+
pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG;
r = superblock_lock(pmd, &sblock);
if (r) {
- DMERR("couldn't read superblock");
+ DMERR("couldn't lock superblock");
goto out;
}