From c510edb9734af1c274d18f4f31a471a166bbc7e8 Mon Sep 17 00:00:00 2001 From: Frank Sorenson Date: Thu, 20 Aug 2026 16:13:10 -0500 Subject: [PATCH] cifs: call pagecache_isize_extended() in cifs_setsize() when extending cifs_setsize() calls truncate_pagecache() but skips pagecache_isize_extended() on extension. truncate_setsize() shows the correct pattern: i_size_write(inode, newsize); if (newsize > oldsize) pagecache_isize_extended(inode, oldsize, newsize); truncate_pagecache(inode, newsize); pagecache_isize_extended() zeroes the tail of the page straddling old EOF. Without it, dirty bytes in that region can be written back to the server, exposing stale data in the newly extended range. Cc: stable@vger.kernel.org Cc: David Howells Signed-off-by: Frank Sorenson Acked-by: Namjae Jeon Signed-off-by: Paulo Alcantara --- fs/smb/client/inode.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c index d459b6f602ca..a5aa1ae23c5f 100644 --- a/fs/smb/client/inode.c +++ b/fs/smb/client/inode.c @@ -3059,6 +3059,8 @@ void cifs_setsize(struct inode *inode, loff_t offset) inode->i_blocks = blocks; spin_unlock(&inode->i_lock); inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); + if (offset > old_size) + pagecache_isize_extended(inode, old_size, offset); truncate_pagecache(inode, offset); netfs_wait_for_outstanding_io(inode); }