patches/kernel/0031-gfs2-Fix-gfs2_file_buffered_write-endless-loop-worka.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Andreas Gruenbacher <agruenba@redhat.com>
   3 Date: Thu, 17 Mar 2022 14:47:24 +0100
   4 Subject: [PATCH] gfs2: Fix gfs2_file_buffered_write endless loop workaround
   5
   6 [ Upstream commit 46f3e0421ccb5474b5c006b0089b9dfd42534bb6 ]
   7
   8 Since commit 554c577cee95b, gfs2_file_buffered_write() can accidentally
   9 return a truncated iov_iter, which might confuse callers.  Fix that.
  10
  11 Fixes: 554c577cee95b ("gfs2: Prevent endless loops in gfs2_file_buffered_write")
  12 Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
  13 Signed-off-by: Sasha Levin <sashal@kernel.org>
  14 Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
  15 ---
  16  fs/gfs2/file.c | 1 +
  17  1 file changed, 1 insertion(+)
  18
  19 diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
  20 index 60390f9dc31f..e93185d804e0 100644
  21 --- a/fs/gfs2/file.c
  22 +++ b/fs/gfs2/file.c
  23 @@ -1086,6 +1086,7 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
  24         gfs2_holder_uninit(gh);
  25         if (statfs_gh)
  26                 kfree(statfs_gh);
  27 +       from->count = orig_count - read;
  28         return read ? read : ret;
  29  }
  30