From: Coly Li Date: Sat, 9 Feb 2019 04:53:08 +0000 (+0800) Subject: bcache: fix input overflow to journal_delay_ms X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=453745fbbebecf7e459785db7e29e11563908525;p=openwrt%2Fstaging%2Fblogic.git bcache: fix input overflow to journal_delay_ms c->journal_delay_ms is in type unsigned short, it is set via sysfs interface and converted by sysfs_strtoul() from input string to unsigned short value. Therefore overflow to unsigned short might be happen when the converted value exceed USHRT_MAX. e.g. writing 65536 into sysfs file journal_delay_ms, c->journal_delay_ms is set to 0. This patch uses sysfs_strtoul_clamp() to convert the input string and limit value range in [0, USHRT_MAX], to avoid the input overflow. Signed-off-by: Coly Li Signed-off-by: Jens Axboe --- diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index d292eb757ac4..201e85bbe3eb 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -821,7 +821,9 @@ STORE(__bch_cache_set) } } - sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); + sysfs_strtoul_clamp(journal_delay_ms, + c->journal_delay_ms, + 0, USHRT_MAX); sysfs_strtoul_bool(verify, c->verify); sysfs_strtoul_bool(key_merging_disabled, c->key_merging_disabled); sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks);