This is a note to let you know that I've just added the patch titled
dell-wmi: Fix access out of memory
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dell-wmi-fix-access-out-of-memory.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a666b6ffbc9b6705a3ced704f52c3fe9ea8bf959 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali.rohar@xxxxxxxxx>
Date: Mon, 29 Sep 2014 15:10:51 +0200
Subject: dell-wmi: Fix access out of memory
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From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali.rohar@xxxxxxxxx>
commit a666b6ffbc9b6705a3ced704f52c3fe9ea8bf959 upstream.
Without this patch, dell-wmi is trying to access elements of dynamically
allocated array without checking the array size. This can lead to memory
corruption or a kernel panic. This patch adds the missing checks for
array size.
Signed-off-by: Pali Rohár <pali.rohar@xxxxxxxxx>
Signed-off-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/platform/x86/dell-wmi.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -163,18 +163,24 @@ static void dell_wmi_notify(u32 value, v
const struct key_entry *key;
int reported_key;
u16 *buffer_entry = (u16 *)obj->buffer.pointer;
+ int buffer_size = obj->buffer.length/2;
- if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
+ if (buffer_size >= 2 && dell_new_hk_type && buffer_entry[1] != 0x10) {
pr_info("Received unknown WMI event (0x%x)\n",
buffer_entry[1]);
kfree(obj);
return;
}
- if (dell_new_hk_type || buffer_entry[1] == 0x0)
+ if (buffer_size >= 3 && (dell_new_hk_type || buffer_entry[1] == 0x0))
reported_key = (int)buffer_entry[2];
- else
+ else if (buffer_size >= 2)
reported_key = (int)buffer_entry[1] & 0xffff;
+ else {
+ pr_info("Received unknown WMI event\n");
+ kfree(obj);
+ return;
+ }
key = sparse_keymap_entry_from_scancode(dell_wmi_input_dev,
reported_key);
Patches currently in stable-queue which might be from pali.rohar@xxxxxxxxx are
queue-3.17/input-alps-ignore-potential-bare-packets-when-device-is-out-of-sync.patch
queue-3.17/dell-wmi-fix-access-out-of-memory.patch
queue-3.17/input-alps-ignore-bad-data-on-dell-latitudes-e6440-and-e7440.patch
queue-3.17/input-alps-allow-up-to-2-invalid-packets-without-resetting-device.patch
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