[PATCH 5.4 029/152] btrfs: fix return value mixup in btrfs_get_extent

From: Greg Kroah-Hartman
Date: Thu Aug 20 2020 - 08:44:44 EST


From: Pavel Machek <pavel@xxxxxxx>

commit 881a3a11c2b858fe9b69ef79ac5ee9978a266dc9 upstream.

btrfs_get_extent() sets variable ret, but out: error path expect error
to be in variable err so the error code is lost.

Fixes: 6bf9e4bd6a27 ("btrfs: inode: Verify inode mode to avoid NULL pointer dereference")
CC: stable@xxxxxxxxxxxxxxx # 5.4+
Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>
Signed-off-by: Pavel Machek (CIP) <pavel@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/btrfs/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7194,7 +7194,7 @@ struct extent_map *btrfs_get_extent(stru
extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
/* Only regular file could have regular/prealloc extent */
if (!S_ISREG(inode->vfs_inode.i_mode)) {
- ret = -EUCLEAN;
+ err = -EUCLEAN;
btrfs_crit(fs_info,
"regular/prealloc extent found for non-regular inode %llu",
btrfs_ino(inode));