1 files changed, 5 insertions, 2 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8e45fdcdbd8e..ffb23e506762 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6503,6 +6503,7 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
         int slot;
         int found_type;
         bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW);
+
         path = btrfs_alloc_path();
         if (!path)
                 return -ENOMEM;
@@ -6546,6 +6547,10 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
         if (!nocow && found_type == BTRFS_FILE_EXTENT_REG)
                 goto out;
 
+        extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
+        if (extent_end <= offset)
+                goto out;
+
         disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
         if (disk_bytenr == 0)
                 goto out;
@@ -6563,8 +6568,6 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
                 *ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
         }
 
-        extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
-
         if (btrfs_extent_readonly(root, disk_bytenr))
                 goto out;
         btrfs_release_path(path);