From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Xiaolong Huang <butterflyhuangxx@gmail.com>,
Arnd Bergmann <arnd@arndb.de>, Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH 4.19 24/37] isdn: cpai: check ctr->cnr to avoid array index out of bound
Date: Mon, 25 Oct 2021 21:14:49 +0200 [thread overview]
Message-ID: <20211025190933.102409577@linuxfoundation.org> (raw)
In-Reply-To: <20211025190926.680827862@linuxfoundation.org>
From: Xiaolong Huang <butterflyhuangxx@gmail.com>
commit 1f3e2e97c003f80c4b087092b225c8787ff91e4d upstream.
The cmtp_add_connection() would add a cmtp session to a controller
and run a kernel thread to process cmtp.
__module_get(THIS_MODULE);
session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d",
session->num);
During this process, the kernel thread would call detach_capi_ctr()
to detach a register controller. if the controller
was not attached yet, detach_capi_ctr() would
trigger an array-index-out-bounds bug.
[ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in
drivers/isdn/capi/kcapi.c:483:21
[ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]'
[ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted
5.15.0-rc2+ #8
[ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS 1.14.0-2 04/01/2014
[ 46.870107][ T6479] Call Trace:
[ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d
[ 46.870974][ T6479] ubsan_epilogue+0x5/0x40
[ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48
[ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0
[ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0
[ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60
[ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120
[ 46.874256][ T6479] kthread+0x147/0x170
[ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40
[ 46.875248][ T6479] ret_from_fork+0x1f/0x30
[ 46.875773][ T6479]
Signed-off-by: Xiaolong Huang <butterflyhuangxx@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20211008065830.305057-1-butterflyhuangxx@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/isdn/capi/kcapi.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -565,6 +565,11 @@ int detach_capi_ctr(struct capi_ctr *ctr
ctr_down(ctr, CAPI_CTR_DETACHED);
+ if (ctr->cnr < 1 || ctr->cnr - 1 >= CAPI_MAXCONTR) {
+ err = -EINVAL;
+ goto unlock_out;
+ }
+
if (capi_controller[ctr->cnr - 1] != ctr) {
err = -EINVAL;
goto unlock_out;
next prev parent reply other threads:[~2021-10-25 19:27 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 19:14 [PATCH 4.19 00/37] 4.19.214-rc1 review Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 01/37] ARM: dts: at91: sama5d2_som1_ek: disable ISC node by default Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 02/37] xtensa: xtfpga: use CONFIG_USE_OF instead of CONFIG_OF Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 03/37] xtensa: xtfpga: Try software restart before simulating CPU reset Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 04/37] NFSD: Keep existing listeners on portlist error Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 05/37] dma-debug: fix sg checks in debug_dma_map_sg() Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 06/37] ASoC: wm8960: Fix clock configuration on slave mode Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 07/37] netfilter: ipvs: make global sysctl readonly in non-init netns Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 08/37] lan78xx: select CRC32 Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 09/37] NIOS2: irqflags: rename a redefined register name Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 10/37] net: hns3: add limit ets dwrr bandwidth cannot be 0 Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 11/37] net: hns3: disable sriov before unload hclge layer Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 12/37] can: rcar_can: fix suspend/resume Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 13/37] can: peak_usb: pcan_usb_fd_decode_status(): fix back to ERROR_ACTIVE state notification Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 14/37] can: peak_pci: peak_pci_remove(): fix UAF Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 15/37] ocfs2: fix data corruption after conversion from inline format Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 16/37] ocfs2: mount fails with buffer overflow in strlen Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 17/37] elfcore: correct reference to CONFIG_UML Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 18/37] vfs: check fd has read access in kernel_read_file_from_fd() Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 19/37] ALSA: usb-audio: Provide quirk for Sennheiser GSP670 Headset Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 20/37] ALSA: hda/realtek: Add quirk for Clevo PC50HS Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 21/37] ASoC: DAPM: Fix missing kctl change notifications Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 22/37] mm, slub: fix mismatch between reconstructed freelist depth and cnt Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 23/37] nfc: nci: fix the UAF of rf_conn_info object Greg Kroah-Hartman
2021-10-25 19:14 ` Greg Kroah-Hartman [this message]
2021-10-25 19:14 ` [PATCH 4.19 25/37] netfilter: Kconfig: use default y instead of m for bool config option Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 26/37] gcc-plugins/structleak: add makefile var for disabling structleak Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 27/37] btrfs: deal with errors when checking if a dir entry exists during log replay Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 28/37] net: stmmac: add support for dwmac 3.40a Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 29/37] ARM: dts: spear3xx: Fix gmac node Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 30/37] isdn: mISDN: Fix sleeping function called from invalid context Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 31/37] platform/x86: intel_scu_ipc: Update timeout value in comment Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 32/37] ALSA: hda: avoid write to STATESTS if controller is in reset Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 33/37] scsi: core: Fix shost->cmd_per_lun calculation in scsi_add_host_with_dma() Greg Kroah-Hartman
2021-10-25 19:14 ` [PATCH 4.19 34/37] usbnet: sanity check for maxpacket Greg Kroah-Hartman
2021-10-25 19:15 ` [PATCH 4.19 35/37] net: mdiobus: Fix memory leak in __mdiobus_register Greg Kroah-Hartman
2021-10-25 19:15 ` [PATCH 4.19 36/37] tracing: Have all levels of checks prevent recursion Greg Kroah-Hartman
2021-10-25 19:15 ` [PATCH 4.19 37/37] ARM: 9122/1: select HAVE_FUTEX_CMPXCHG Greg Kroah-Hartman
2021-10-25 21:37 ` [PATCH 4.19 00/37] 4.19.214-rc1 review Pavel Machek
2021-10-26 9:16 ` Jon Hunter
2021-10-26 9:17 ` Jon Hunter
2021-10-26 13:09 ` Naresh Kamboju
2021-10-26 17:30 ` Shuah Khan
2021-10-26 18:18 ` Sudip Mukherjee
2021-10-26 19:15 ` Guenter Roeck
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