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authorAl Viro <viro@zeniv.linux.org.uk>2019-01-27 04:58:00 +0000
committerDavid Sterba <dsterba@suse.com>2019-01-30 18:16:40 +0100
commit92900e5160a5444d47dd376bc40066b709fbb5a6 (patch)
tree16fe4e2b48d4610448fe00759383ad686838ce08 /fs
parent302167c50b32e7fccc98994a91d40ddbbab04e52 (diff)
btrfs: fix potential oops in device_list_add
alloc_fs_devices() can return ERR_PTR(-ENOMEM), so dereferencing its result before the check for IS_ERR() is a bad idea. Fixes: d1a63002829a4 ("btrfs: add members to fs_devices to track fsid changes") Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/volumes.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 3e4f8f88353e..15561926ab32 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -957,11 +957,11 @@ static noinline struct btrfs_device *device_list_add(const char *path,
else
fs_devices = alloc_fs_devices(disk_super->fsid, NULL);
- fs_devices->fsid_change = fsid_change_in_progress;
-
if (IS_ERR(fs_devices))
return ERR_CAST(fs_devices);
+ fs_devices->fsid_change = fsid_change_in_progress;
+
mutex_lock(&fs_devices->device_list_mutex);
list_add(&fs_devices->fs_list, &fs_uuids);