From: Anthony Romano <anthony.romano@xxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit b9b4bb26af017dbe930cd4df7f9b2fc3a0497bfe ]
When fallocate is interrupted it will undo a range that extends one byte
past its range of allocated pages. This can corrupt an in-use page by
zeroing out its first byte. Instead, undo using the inclusive byte
range.
Fixes: 1635f6a74152f1d ("tmpfs: undo fallocation on failure")
Link: http://lkml.kernel.org/r/1462713387-16724-1-git-send-email-anthony.romano@xxxxxxxxxx
Signed-off-by: Anthony Romano <anthony.romano@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Brandon Philips <brandon@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
mm/shmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index 0b4ba55..0087cea 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2142,7 +2142,7 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
/* Remove the !PageUptodate pages we added */
shmem_undo_range(inode,
(loff_t)start << PAGE_CACHE_SHIFT,
- (loff_t)index << PAGE_CACHE_SHIFT, true);
+ ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true);
goto undone;
}
--
2.5.0
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