From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Tong Zhang <ztong0001@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 03/14] mISDN: fix crash in fritzpci
Date: Fri, 9 Apr 2021 11:53:28 +0200 [thread overview]
Message-ID: <20210409095300.504622651@linuxfoundation.org> (raw)
In-Reply-To: <20210409095300.391558233@linuxfoundation.org>
From: Tong Zhang <ztong0001@gmail.com>
[ Upstream commit a9f81244d2e33e6dfcef120fefd30c96b3f7cdb0 ]
setup_fritz() in avmfritz.c might fail with -EIO and in this case the
isac.type and isac.write_reg is not initialized and remains 0(NULL).
A subsequent call to isac_release() will dereference isac->write_reg and
crash.
[ 1.737444] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 1.737809] #PF: supervisor instruction fetch in kernel mode
[ 1.738106] #PF: error_code(0x0010) - not-present page
[ 1.738378] PGD 0 P4D 0
[ 1.738515] Oops: 0010 [#1] SMP NOPTI
[ 1.738711] CPU: 0 PID: 180 Comm: systemd-udevd Not tainted 5.12.0-rc2+ #78
[ 1.739077] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-48-gd9c812dda519-p
rebuilt.qemu.org 04/01/2014
[ 1.739664] RIP: 0010:0x0
[ 1.739807] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
[ 1.740200] RSP: 0018:ffffc9000027ba10 EFLAGS: 00010202
[ 1.740478] RAX: 0000000000000000 RBX: ffff888102f41840 RCX: 0000000000000027
[ 1.740853] RDX: 00000000000000ff RSI: 0000000000000020 RDI: ffff888102f41800
[ 1.741226] RBP: ffffc9000027ba20 R08: ffff88817bc18440 R09: ffffc9000027b808
[ 1.741600] R10: 0000000000000001 R11: 0000000000000001 R12: ffff888102f41840
[ 1.741976] R13: 00000000fffffffb R14: ffff888102f41800 R15: ffff8881008b0000
[ 1.742351] FS: 00007fda3a38a8c0(0000) GS:ffff88817bc00000(0000) knlGS:0000000000000000
[ 1.742774] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.743076] CR2: ffffffffffffffd6 CR3: 00000001021ec000 CR4: 00000000000006f0
[ 1.743452] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1.743828] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1.744206] Call Trace:
[ 1.744339] isac_release+0xcc/0xe0 [mISDNipac]
[ 1.744582] fritzpci_probe.cold+0x282/0x739 [avmfritz]
[ 1.744861] local_pci_probe+0x48/0x80
[ 1.745063] pci_device_probe+0x10f/0x1c0
[ 1.745278] really_probe+0xfb/0x420
[ 1.745471] driver_probe_device+0xe9/0x160
[ 1.745693] device_driver_attach+0x5d/0x70
[ 1.745917] __driver_attach+0x8f/0x150
[ 1.746123] ? device_driver_attach+0x70/0x70
[ 1.746354] bus_for_each_dev+0x7e/0xc0
[ 1.746560] driver_attach+0x1e/0x20
[ 1.746751] bus_add_driver+0x152/0x1f0
[ 1.746957] driver_register+0x74/0xd0
[ 1.747157] ? 0xffffffffc00d8000
[ 1.747334] __pci_register_driver+0x54/0x60
[ 1.747562] AVM_init+0x36/0x1000 [avmfritz]
[ 1.747791] do_one_initcall+0x48/0x1d0
[ 1.747997] ? __cond_resched+0x19/0x30
[ 1.748206] ? kmem_cache_alloc_trace+0x390/0x440
[ 1.748458] ? do_init_module+0x28/0x250
[ 1.748669] do_init_module+0x62/0x250
[ 1.748870] load_module+0x23ee/0x26a0
[ 1.749073] __do_sys_finit_module+0xc2/0x120
[ 1.749307] ? __do_sys_finit_module+0xc2/0x120
[ 1.749549] __x64_sys_finit_module+0x1a/0x20
[ 1.749782] do_syscall_64+0x38/0x90
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/isdn/hardware/mISDN/mISDNipac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/isdn/hardware/mISDN/mISDNipac.c b/drivers/isdn/hardware/mISDN/mISDNipac.c
index e240010b93fa..c87cb193830c 100644
--- a/drivers/isdn/hardware/mISDN/mISDNipac.c
+++ b/drivers/isdn/hardware/mISDN/mISDNipac.c
@@ -711,7 +711,7 @@ isac_release(struct isac_hw *isac)
{
if (isac->type & IPAC_TYPE_ISACX)
WriteISAC(isac, ISACX_MASK, 0xff);
- else
+ else if (isac->type != 0)
WriteISAC(isac, ISAC_MASK, 0xff);
if (isac->dch.timer.function != NULL) {
del_timer(&isac->dch.timer);
--
2.30.2
next prev parent reply other threads:[~2021-04-09 9:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-09 9:53 [PATCH 4.14 00/14] 4.14.230-rc1 review Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 01/14] ARM: dts: am33xx: add aliases for mmc interfaces Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 02/14] net: pxa168_eth: Fix a potential data race in pxa168_eth_remove Greg Kroah-Hartman
2021-04-09 9:53 ` Greg Kroah-Hartman [this message]
2021-04-09 9:53 ` [PATCH 4.14 04/14] mac80211: choose first enabled channel for monitor Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 05/14] drm/msm: Ratelimit invalid-fence message Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 06/14] platform/x86: thinkpad_acpi: Allow the FnLock LED to change state Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 07/14] x86/build: Turn off -fcf-protection for realmode targets Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 08/14] scsi: target: pscsi: Clean up after failure in pscsi_map_sg() Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 09/14] ia64: mca: allocate early mca with GFP_ATOMIC Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 10/14] cifs: revalidate mapping when we open files for SMB1 POSIX Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 11/14] cifs: Silently ignore unknown oplock break handle Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 12/14] bpf, x86: Validate computation of branch displacements for x86-64 Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 13/14] init/Kconfig: make COMPILE_TEST depend on !S390 Greg Kroah-Hartman
2021-04-09 9:53 ` [PATCH 4.14 14/14] init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM Greg Kroah-Hartman
2021-04-09 20:13 ` [PATCH 4.14 00/14] 4.14.230-rc1 review Guenter Roeck
2021-04-10 4:53 ` Guenter Roeck
2021-04-10 9:21 ` Naresh Kamboju
2021-04-10 15:46 ` Guenter Roeck
2021-04-10 13:15 ` Greg Kroah-Hartman
2021-04-10 15:01 ` Guenter Roeck
2021-04-10 9:19 ` Naresh Kamboju
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