From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Tue, 9 Nov 2021 12:57:17 +0000 (+0100)
Subject: gfs2: Prevent endless loops in gfs2_file_buffered_write
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e4ea3286b1aa136e478779a791260a8f8d9e77f4;p=linux.git

gfs2: Prevent endless loops in gfs2_file_buffered_write

[ Upstream commit 554c577cee95bdc1d03d9f457e57dc96eb791845 ]

Currently, instead of performing a short write,
iomap_file_buffered_write will fail when part of its iov iterator cannot
be read.  In contrast, gfs2_file_buffered_write will loop around if it
can read part of the iov iterator, so we can end up in an endless loop.

This should be fixed in iomap_file_buffered_write (and also
generic_perform_write), but this comes a bit late in the 5.16
development cycle, so work around it in the filesystem by
trimming the iov iterator to the known-good size for now.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 247b8d95b5ef4..97e2793e22d71 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -1021,6 +1021,7 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
 	struct gfs2_sbd *sdp = GFS2_SB(inode);
 	struct gfs2_holder *statfs_gh = NULL;
 	size_t prev_count = 0, window_size = 0;
+	size_t orig_count = iov_iter_count(from);
 	size_t read = 0;
 	ssize_t ret;
 
@@ -1065,6 +1066,7 @@ retry_under_glock:
 	if (inode == sdp->sd_rindex)
 		gfs2_glock_dq_uninit(statfs_gh);
 
+	from->count = orig_count - read;
 	if (should_fault_in_pages(ret, from, &prev_count, &window_size)) {
 		size_t leftover;
 
@@ -1072,6 +1074,7 @@ retry_under_glock:
 		leftover = fault_in_iov_iter_readable(from, window_size);
 		gfs2_holder_disallow_demote(gh);
 		if (leftover != window_size) {
+			from->count = min(from->count, window_size - leftover);
 			if (!gfs2_holder_queued(gh)) {
 				if (read)
 					goto out_uninit;