gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump

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[ Upstream commit 8877243bea ]

Syzkaller has reported a NULL pointer dereference when accessing
rgd->rd_rgl in gfs2_rgrp_dump().  This can happen when creating
rgd->rd_gl fails in read_rindex_entry().  Add a NULL pointer check in
gfs2_rgrp_dump() to prevent that.

Reported-and-tested-by: syzbot+da0fc229cc1ff4bb2e6d@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=da0fc229cc1ff4bb2e6d
Fixes: 72244b6bc7 ("gfs2: improve debug information when lvb mismatches are found")
Signed-off-by: Osama Muhammad <osmtendev@gmail.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Osama Muhammad 2023-11-06 21:21:29 +05:00 • committed by Greg Kroah-Hartman

parent 3c5adf160e

commit c323efd620

1 changed files with 1 additions and 1 deletions

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fs/gfs2/rgrp.c

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