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| author |   Coly Li <colyli@suse.de> | 2019-02-09 12:53:08 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2019-02-09 07:18:32 -0700 |
| commit | 453745fbbebecf7e459785db7e29e11563908525 (patch) | |
| tree | f8dd8f67d3f4bc2f92fcdae7604719ff46823843 /drivers/md | |
| parent | bcache: fix input overflow to writeback_rate_minimum (diff) | |
| download | linux-dev-453745fbbebecf7e459785db7e29e11563908525.tar.xz linux-dev-453745fbbebecf7e459785db7e29e11563908525.zip | |
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 <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/sysfs.c | 4 |
1 files changed, 3 insertions, 1 deletions
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); |