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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Tuo Li <islituo@gmail.com>, TOTE Robot <oslab@tsinghua.edu.cn>,
Jeff Layton <jlayton@kernel.org>,
Ilya Dryomov <idryomov@gmail.com>,
Sasha Levin <sashal@kernel.org>,
ceph-devel@vger.kernel.org
Subject: [PATCH AUTOSEL 5.13 10/14] ceph: fix possible null-pointer dereference in ceph_mdsmap_decode()
Date: Mon, 30 Aug 2021 07:59:38 -0400 [thread overview]
Message-ID: <20210830115942.1017300-10-sashal@kernel.org> (raw)
In-Reply-To: <20210830115942.1017300-1-sashal@kernel.org>
From: Tuo Li <islituo@gmail.com>
[ Upstream commit a9e6ffbc5b7324b6639ee89028908b1e91ceed51 ]
kcalloc() is called to allocate memory for m->m_info, and if it fails,
ceph_mdsmap_destroy() behind the label out_err will be called:
ceph_mdsmap_destroy(m);
In ceph_mdsmap_destroy(), m->m_info is dereferenced through:
kfree(m->m_info[i].export_targets);
To fix this possible null-pointer dereference, check m->m_info before the
for loop to free m->m_info[i].export_targets.
[ jlayton: fix up whitespace damage
only kfree(m->m_info) if it's non-NULL ]
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Tuo Li <islituo@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ceph/mdsmap.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index abd9af7727ad..3c444b9cb17b 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -394,9 +394,11 @@ void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
{
int i;
- for (i = 0; i < m->possible_max_rank; i++)
- kfree(m->m_info[i].export_targets);
- kfree(m->m_info);
+ if (m->m_info) {
+ for (i = 0; i < m->possible_max_rank; i++)
+ kfree(m->m_info[i].export_targets);
+ kfree(m->m_info);
+ }
kfree(m->m_data_pg_pools);
kfree(m);
}
--
2.30.2
next prev parent reply other threads:[~2021-08-30 12:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-30 11:59 [PATCH AUTOSEL 5.13 01/14] gpu: ipu-v3: Fix i.MX IPU-v3 offset calculations for (semi)planar U/V formats Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 02/14] reset: reset-zynqmp: Fixed the argument data type Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 03/14] qed: Fix the VF msix vectors flow Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 04/14] net: dsa: mv88e6xxx: Update mv88e6393x serdes errata Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 05/14] riscv: dts: microchip: Use 'local-mac-address' for emac1 Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 06/14] riscv: dts: microchip: Add ethernet0 to the aliases node Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 07/14] net: macb: Add a NULL check on desc_ptp Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 08/14] qede: Fix memset corruption Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 09/14] perf/x86/intel/pt: Fix mask of num_address_ranges Sasha Levin
2021-08-30 11:59 ` Sasha Levin [this message]
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 11/14] perf/x86/amd/ibs: Work around erratum #1197 Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 12/14] perf/x86/amd/power: Assign pmu.module Sasha Levin
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 13/14] net: fix NULL pointer reference in cipso_v4_doi_free Sasha Levin
2021-08-30 12:42 ` Dongliang Mu
2021-08-30 14:20 ` Paul Moore
2021-09-05 12:54 ` Sasha Levin
2021-09-07 13:06 ` Paul Moore
2021-08-30 11:59 ` [PATCH AUTOSEL 5.13 14/14] cryptoloop: add a deprecation warning Sasha Levin
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