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-rw-r--r--fs/iomap.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/iomap.c b/fs/iomap.c
index 72f3864a2e6b..77c214194edf 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -1677,7 +1677,14 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
dio->submit.cookie = submit_bio(bio);
} while (nr_pages);
- if (need_zeroout) {
+ /*
+ * We need to zeroout the tail of a sub-block write if the extent type
+ * requires zeroing or the write extends beyond EOF. If we don't zero
+ * the block tail in the latter case, we can expose stale data via mmap
+ * reads of the EOF block.
+ */
+ if (need_zeroout ||
+ ((dio->flags & IOMAP_DIO_WRITE) && pos >= i_size_read(inode))) {
/* zero out from the end of the write to the end of the block */
pad = pos & (fs_block_size - 1);
if (pad)