[PATCH 5.16 0931/1017] gfs2: Fix gfs2_file_buffered_write endless loop workaround

Greg Kroah-Hartman
2022-04-05T10:17:52Z

From: Andreas Gruenbacher <agruenba@redhat.com>

commit 46f3e0421ccb5474b5c006b0089b9dfd42534bb6 upstream.

Since commit 554c577cee95b, gfs2_file_buffered_write() can accidentally
return a truncated iov_iter, which might confuse callers. Fix that.

Fixes: 554c577cee95b ("gfs2: Prevent endless loops in gfs2_file_buffered_write")
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/gfs2/file.c | 1 +
1 file changed, 1 insertion(+)

--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -1083,6 +1083,7 @@ out_uninit:
gfs2_holder_uninit(gh);
if (statfs_gh)
kfree(statfs_gh);
+ from->count = orig_count - read;
return read ? read : ret;
}