[PATCH 4/25] NTFS: Fix two nasty runlist merging bugs that had gone unnoticed
so far. Thanks to Stefano Picerno for the bug report.
Signed-off-by: Anton Altaparmakov <[email protected]>
---
fs/ntfs/ChangeLog | 2 ++
fs/ntfs/runlist.c | 5 +++--
2 files changed, 5 insertions(+), 2 deletions(-)
84d6ebe63f50b6efd8be252b58a207132157c60f
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -43,6 +43,8 @@ ToDo/Notes:
- Use ntfs_malloc_nofs_nofail() in the two critical regions in
fs/ntfs/runlist.c::ntfs_runlists_merge(). This means we no longer
need to panic() if the allocation fails as it now cannot fail.
+ - Fix two nasty runlist merging bugs that had gone unnoticed so far.
+ Thanks to Stefano Picerno for the bug report.
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
--- a/fs/ntfs/runlist.c
+++ b/fs/ntfs/runlist.c
@@ -542,6 +542,7 @@ runlist_element *ntfs_runlists_merge(run
/* Scan to the end of the source runlist. */
for (dend = 0; likely(drl[dend].length); dend++)
;
+ dend++;
drl = ntfs_rl_realloc(drl, dend, dend + 1);
if (IS_ERR(drl))
return drl;
@@ -611,8 +612,8 @@ runlist_element *ntfs_runlists_merge(run
((drl[dins].vcn + drl[dins].length) <= /* End of hole */
(srl[send - 1].vcn + srl[send - 1].length)));
- /* Or we'll lose an end marker */
- if (start && finish && (drl[dins].length == 0))
+ /* Or we will lose an end marker. */
+ if (finish && !drl[dins].length)
ss++;
if (marker && (drl[dins].vcn + drl[dins].length > srl[send - 1].vcn))
finish = FALSE;
-
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