serial: samsung: Fix possible out of bounds access on non-DT platform
authorKrzysztof Kozlowski <k.kozlowski@samsung.com>
Thu, 16 Jun 2016 06:27:36 +0000 (08:27 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 25 Jun 2016 20:50:53 +0000 (13:50 -0700)
commit926b7b5122c96e1f18cd20e85a286c7ec8d18c97
tree982d6a4394b0da84a4b7682459f412355fc38cd0
parente51e4d8a185de90424b03f30181b35f29c46a25a
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>
drivers/tty/serial/samsung.c