Messages in this thread Patch in this message | | | From | Krzysztof Kozlowski <> | Subject | [PATCH v2 2/2] serial: samsung: Fix possible out of bounds access on non-DT platform | Date | Tue, 31 May 2016 16:00:06 +0200 |
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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@samsung.com> Fixes: b497549a035c ("[ARM] S3C24XX: Split serial driver into core and per-cpu drivers") Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
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Not cc-ing stable because: 1. It is just a possibility, not really reproduced (I don't have non-DT platform). 2. I am not sure whether deferred probe may happen on non-DT platform.
Changes since v1: 1. New patch. --- drivers/tty/serial/samsung.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index f0bd2ec0db59..4d2924f61e0b 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1844,8 +1844,6 @@ static int s3c24xx_serial_probe(struct platform_device *pdev) 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); @@ -1875,6 +1873,8 @@ static int s3c24xx_serial_probe(struct platform_device *pdev) if (ret < 0) dev_err(&pdev->dev, "failed to add cpufreq notifier\n"); + probe_index++; + return 0; } -- 1.9.1
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