From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Adam Ford <aford173@gmail.com>,
Yegor Yefremov <yegorslists@googlemail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sasha Levin <sashal@kernel.org>,
linux-serial@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 11/21] serial: mctrl_gpio: Check for NULL pointer
Date: Fri, 18 Oct 2019 18:09:57 -0400 [thread overview]
Message-ID: <20191018221007.10851-11-sashal@kernel.org> (raw)
In-Reply-To: <20191018221007.10851-1-sashal@kernel.org>
From: Adam Ford <aford173@gmail.com>
[ Upstream commit 37e3ab00e4734acc15d96b2926aab55c894f4d9c ]
When using mctrl_gpio_to_gpiod, it dereferences gpios into a single
requested GPIO. This dereferencing can break if gpios is NULL,
so this patch adds a NULL check before dereferencing it. If
gpios is NULL, this function will also return NULL.
Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Link: https://lore.kernel.org/r/20191006163314.23191-1-aford173@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/serial/serial_mctrl_gpio.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 02147361eaa94..2b5329a3d716a 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -67,6 +67,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set);
struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
enum mctrl_gpio_idx gidx)
{
+ if (gpios == NULL)
+ return NULL;
+
return gpios->gpio[gidx];
}
EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod);
--
2.20.1
next prev parent reply other threads:[~2019-10-18 22:10 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 22:09 [PATCH AUTOSEL 4.4 01/21] sc16is7xx: Fix for "Unexpected interrupt: 8" Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 02/21] x86/cpu: Add Atom Tremont (Jacobsville) Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 03/21] scripts/setlocalversion: Improve -dirty check with git-status --no-optional-locks Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 04/21] usb: handle warm-reset port requests on hub resume Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 05/21] exec: load_script: Do not exec truncated interpreter path Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 06/21] iio: fix center temperature of bmc150-accel-core Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 07/21] perf map: Fix overlapped map handling Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 08/21] RDMA/iwcm: Fix a lock inversion issue Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 09/21] nfs: Fix nfsi->nrequests count error on nfs_inode_remove_request Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 10/21] fs: cifs: mute -Wunused-const-variable message Sasha Levin
2019-10-18 22:09 ` Sasha Levin [this message]
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 12/21] efi/cper: Fix endianness of PCIe class code Sasha Levin
2019-10-18 22:09 ` [PATCH AUTOSEL 4.4 13/21] efi/x86: Do not clean dummy variable in kexec path Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 14/21] fs: ocfs2: fix possible null-pointer dereferences in ocfs2_xa_prepare_entry() Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 15/21] fs: ocfs2: fix a possible null-pointer dereference in ocfs2_info_scan_inode_alloc() Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 16/21] iio: adc: ad799x: fix probe error handling Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 17/21] iio: light: opt3001: fix mutex unlock race Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 18/21] MIPS: fw: sni: Fix out of bounds init of o32 stack Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 19/21] USB: usb-skeleton: fix use-after-free after driver unbind Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 20/21] NFSv4: Fix leak of clp->cl_acceptor string Sasha Levin
2019-10-18 22:10 ` [PATCH AUTOSEL 4.4 21/21] tracing: Initialize iter->seq after zeroing in tracing_read_pipe() Sasha Levin
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