This is a note to let you know that I've just added the patch titled
serial: samsung: Fix possible out of bounds access on non-DT platform
to the 4.4-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:
serial-samsung-fix-possible-out-of-bounds-access-on-non-dt-platform.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 926b7b5122c96e1f18cd20e85a286c7ec8d18c97 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Date: Thu, 16 Jun 2016 08:27:36 +0200
Subject: serial: samsung: Fix possible out of bounds access on non-DT platform
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
commit 926b7b5122c96e1f18cd20e85a286c7ec8d18c97 upstream.
On non-DeviceTree platforms, the index of serial device is a static
variable incremented on each probe. It is incremented even if deferred
probe happens when getting the clock in s3c24xx_serial_init_port().
This index is used for referencing elements of statically allocated
s3c24xx_serial_ports array. In case of re-probe, the index will point
outside of this array leading to memory corruption.
Increment the index only on successful probe.
Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Fixes: b497549a035c ("[ARM] S3C24XX: Split serial driver into core and per-cpu drivers")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/samsung.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1841,8 +1841,6 @@ static int s3c24xx_serial_probe(struct p
ourport->min_dma_size = max_t(int, ourport->port.fifosize,
dma_get_cache_alignment());
- probe_index++;
-
dbg("%s: initialising port %p...\n", __func__, ourport);
ret = s3c24xx_serial_init_port(ourport, pdev);
@@ -1872,6 +1870,8 @@ static int s3c24xx_serial_probe(struct p
if (ret < 0)
dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
+ probe_index++;
+
return 0;
}
Patches currently in stable-queue which might be from krzk@xxxxxxxxxx are
queue-4.4/serial-samsung-fix-possible-out-of-bounds-access-on-non-dt-platform.patch
