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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2016-06-16 08:27:36 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-06-25 13:50:53 -0700
commit926b7b5122c96e1f18cd20e85a286c7ec8d18c97 (patch)
tree982d6a4394b0da84a4b7682459f412355fc38cd0 /drivers/tty
parente51e4d8a185de90424b03f30181b35f29c46a25a (diff)
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serial: samsung: Fix possible out of bounds access on non-DT platform
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/samsung.c4
1 files 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;
}