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cifs: call pagecache_isize_extended() in cifs_setsize() when extending

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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 <dhowells@redhat.com>
Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
This commit is contained in:
Frank Sorenson
2026-08-20 16:13:10 -05:00
committed by Paulo Alcantara
parent 5d14030b46
commit c510edb973
1 changed files with 2 additions and 0 deletions
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2
fs/smb/client/inode.c
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@@ -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);
}