sisfb: read buffer overflow
sisfb: read buffer overflow

If called with mode_idx = 1, rate = 68, a read occurs from
sisfb_vrate[-1].refresh.

Signed-off-by: Roel Kluin <aa9c6213291cec1ff07688554fb7b904b9ffe4e3@gmail.com>
Cc: Krzysztof Helt <e36322531041744f35a39a40f0faffcfb5b388ff@poczta.fm>
Cc: Thomas Winischhofer <5f50a84c1fa3bcff146405017f36aec1a10a9e38@winischhofer.net>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs