author: Harshad Shirwadkar <harshadshirwadkar@gmail.com> 2020-04-20 19:39:59 -0700
committer: Theodore Ts'o <tytso@mit.edu> 2020-06-03 23:16:49 -0400
commit: c36a71b4e35ab35340facdd6964a00956b9fef0a
parent: 39c0ae163f3b3ae691e7cce226ba1984ef6456b1
Commit Summary:
Diffstat:
1 file changed, 6 insertions, 3 deletions
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h
index 1c216fcc202a..44e59881a1f0 100644
--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -170,10 +170,13 @@ struct partial_cluster {
(EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
#define EXT_LAST_INDEX(__hdr__) \
(EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
-#define EXT_MAX_EXTENT(__hdr__) \
- (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
+#define EXT_MAX_EXTENT(__hdr__) \
+ ((le16_to_cpu((__hdr__)->eh_max)) ? \
+ ((EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)) \
+ : 0)
#define EXT_MAX_INDEX(__hdr__) \
- (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
+ ((le16_to_cpu((__hdr__)->eh_max)) ? \
+ ((EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)) : 0)
static inline struct ext4_extent_header *ext_inode_hdr(struct inode *inode)
{