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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jia-Ju Bai <baijiaju1990@gmail.com>,
	Casey Schaufler <casey@schaufler-ca.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-security-module@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 21/33] security: smack: Fix possible null-pointer dereferences in smack_socket_sock_rcv_skb()
Date: Sun, 29 Sep 2019 13:34:09 -0400	[thread overview]
Message-ID: <20190929173424.9361-21-sashal@kernel.org> (raw)
In-Reply-To: <20190929173424.9361-1-sashal@kernel.org>

From: Jia-Ju Bai <baijiaju1990@gmail.com>

[ Upstream commit 3f4287e7d98a2954f20bf96c567fdffcd2b63eb9 ]

In smack_socket_sock_rcv_skb(), there is an if statement
on line 3920 to check whether skb is NULL:
    if (skb && skb->secmark != 0)

This check indicates skb can be NULL in some cases.

But on lines 3931 and 3932, skb is used:
    ad.a.u.net->netif = skb->skb_iif;
    ipv6_skb_to_auditdata(skb, &ad.a, NULL);

Thus, possible null-pointer dereferences may occur when skb is NULL.

To fix these possible bugs, an if statement is added to check skb.

These bugs are found by a static analysis tool STCheck written by us.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 security/smack/smack_lsm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 017c47eb795eb..120bd56e5d89e 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4005,6 +4005,8 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 			skp = smack_ipv6host_label(&sadd);
 		if (skp == NULL)
 			skp = smack_net_ambient;
+		if (skb == NULL)
+			break;
 #ifdef CONFIG_AUDIT
 		smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
 		ad.a.u.net->family = family;
-- 
2.20.1


  parent reply	other threads:[~2019-09-29 17:40 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-29 17:33 [PATCH AUTOSEL 4.19 01/33] MIPS: Ingenic: Disable broken BTB lookup optimization Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 02/33] clk: jz4740: Add TCU clock Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 03/33] MIPS: tlbex: Explicitly cast _PAGE_NO_EXEC to a boolean Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 04/33] i2c-cht-wc: Fix lockdep warning Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 05/33] mfd: intel-lpss: Remove D3cold delay Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 06/33] PCI: tegra: Fix OF node reference leak Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 07/33] HID: wacom: Fix several minor compiler warnings Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 08/33] livepatch: Nullify obj->mod in klp_module_coming()'s error path Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 09/33] ARM: 8898/1: mm: Don't treat faults reported from cache maintenance as writes Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 10/33] soundwire: intel: fix channel number reported by hardware Sasha Levin
2019-09-29 17:33 ` [PATCH AUTOSEL 4.19 11/33] ARM: 8875/1: Kconfig: default to AEABI w/ Clang Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 12/33] MIPS: lantiq: update the clock alias' for the mainline PCIe PHY driver Sasha Levin
2019-09-29 17:40   ` Martin Blumenstingl
2019-10-05 23:01     ` Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 13/33] firmware: bcm47xx_nvram: Correct size_t printf format Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 14/33] rtc: snvs: fix possible race condition Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 15/33] rtc: pcf85363/pcf85263: fix regmap error in set_time Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 16/33] HID: apple: Fix stuck function keys when using FN Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 17/33] PCI: rockchip: Propagate errors for optional regulators Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 18/33] PCI: histb: " Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 19/33] PCI: imx6: " Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 20/33] PCI: exynos: Propagate errors for optional PHYs Sasha Levin
2019-09-29 17:34 ` Sasha Levin [this message]
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 22/33] ARM: 8903/1: ensure that usable memory in bank 0 starts from a PMD-aligned address Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 23/33] fat: work around race with userspace's read via blockdev while mounting Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 24/33] pktcdvd: remove warning on attempting to register non-passthrough dev Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 25/33] hypfs: Fix error number left in struct pointer member Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 26/33] crypto: hisilicon - Fix double free in sec_free_hw_sgl() Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 27/33] kbuild: clean compressed initramfs image Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 28/33] ocfs2: wait for recovering done after direct unlock request Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 29/33] kmemleak: increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default to 16K Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 30/33] arm64: consider stack randomization for mmap base only when necessary Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 31/33] mips: properly account for stack randomization and stack guard gap Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 32/33] arm: " Sasha Levin
2019-09-29 17:34 ` [PATCH AUTOSEL 4.19 33/33] arm: use STACK_TOP when computing mmap base address Sasha Levin

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