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-rw-r--r--fs/ext4/move_extent.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index a409ff70d67b..2f5be02fc6f6 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -516,9 +516,13 @@ mext_check_arguments(struct inode *orig_inode,
orig_inode->i_ino, donor_inode->i_ino);
return -EINVAL;
}
- if (orig_eof < orig_start + *len - 1)
+ if (orig_eof <= orig_start)
+ *len = 0;
+ else if (orig_eof < orig_start + *len - 1)
*len = orig_eof - orig_start;
- if (donor_eof < donor_start + *len - 1)
+ if (donor_eof <= donor_start)
+ *len = 0;
+ else if (donor_eof < donor_start + *len - 1)
*len = donor_eof - donor_start;
if (!*len) {
ext4_debug("ext4 move extent: len should not be 0 "