diff options
| author | Coly Li <colyli@suse.de> | 2019-02-09 07:53:10 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-02-09 17:18:33 +0300 |
| commit | a91fbda49f746119828f7e8ad0f0aa2ab0578f65 (patch) | |
| tree | 146a7c1d8048648530d36fd11ec0e31a1557373f /drivers/md | |
| parent | b15008403b59955c9fa0c8b55cadd6dae991a4e9 (diff) | |
| download | linux-a91fbda49f746119828f7e8ad0f0aa2ab0578f65.tar.xz | |
bcache: fix input overflow to cache set sysfs file io_error_halflife
Cache set sysfs entry io_error_halflife is used to set c->error_decay.
c->error_decay is in type unsigned int, and it is converted by
strtoul_or_return(), therefore overflow to c->error_decay is possible
for a large input value.
This patch fixes the overflow by using strtoul_safe_clamp() to convert
input string to an unsigned long value in range [0, UINT_MAX], then
divides by 88 and set it to c->error_decay.
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 | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 467105614324..17bae9c14ca0 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -804,8 +804,17 @@ STORE(__bch_cache_set) sysfs_strtoul_clamp(io_error_limit, c->error_limit, 0, UINT_MAX); /* See count_io_errors() for why 88 */ - if (attr == &sysfs_io_error_halflife) - c->error_decay = strtoul_or_return(buf) / 88; + if (attr == &sysfs_io_error_halflife) { + unsigned long v = 0; + ssize_t ret; + + ret = strtoul_safe_clamp(buf, v, 0, UINT_MAX); + if (!ret) { + c->error_decay = v / 88; + return size; + } + return ret; + } if (attr == &sysfs_io_disable) { v = strtoul_or_return(buf); |