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-rw-r--r--mm/shmem.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 86c150bf8235..46511ad90bc5 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2137,9 +2137,11 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
NULL);
if (error) {
/* Remove the !PageUptodate pages we added */
- shmem_undo_range(inode,
- (loff_t)start << PAGE_CACHE_SHIFT,
- ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true);
+ if (index > start) {
+ shmem_undo_range(inode,
+ (loff_t)start << PAGE_CACHE_SHIFT,
+ ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true);
+ }
goto undone;
}