NTFS: Fix handling of valid but empty mapping pairs array in
fs/ntfs/runlist.c::ntfs_mapping_pairs_decompress().
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
index f4c27f7..8fe38c8 100644
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -46,6 +46,8 @@
- Fix two nasty runlist merging bugs that had gone unnoticed so far.
Thanks to Stefano Picerno for the bug report.
- Remove two bogus BUG_ON()s from fs/ntfs/mft.c.
+ - Fix handling of valid but empty mapping pairs array in
+ fs/ntfs/runlist.c::ntfs_mapping_pairs_decompress().
2.1.23 - Implement extension of resident files and make writing safe as well as
many bug fixes, cleanups, and enhancements...
diff --git a/fs/ntfs/runlist.c b/fs/ntfs/runlist.c
index d26a1be..e4c4716 100644
--- a/fs/ntfs/runlist.c
+++ b/fs/ntfs/runlist.c
@@ -760,6 +760,9 @@
ntfs_error(vol->sb, "Corrupt attribute.");
return ERR_PTR(-EIO);
}
+ /* If the mapping pairs array is valid but empty, nothing to do. */
+ if (!vcn && !*buf)
+ return old_rl;
/* Current position in runlist array. */
rlpos = 0;
/* Allocate first page and set current runlist size to one page. */