From: Coly Li <colyli@suse.de>
To: axboe@kernel.dk
Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org,
Coly Li <colyli@suse.de>
Subject: [PATCH 16/19] bcache: fix input overflow to journal_delay_ms
Date: Sat, 9 Feb 2019 12:53:08 +0800 [thread overview]
Message-ID: <20190209045311.15677-17-colyli@suse.de> (raw)
In-Reply-To: <20190209045311.15677-1-colyli@suse.de>
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>
---
drivers/md/bcache/sysfs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
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);
--
2.16.4
next prev parent reply other threads:[~2019-02-09 4:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-09 4:52 [PATCH 00/19] bcache patches for Linux v5.1 Coly Li
2019-02-09 4:52 ` [PATCH 01/19] bcache: never writeback a discard operation Coly Li
2019-02-09 4:52 ` [PATCH 02/19] bcache: not use hard coded memset size in bch_cache_accounting_clear() Coly Li
2019-02-09 4:52 ` [PATCH 03/19] bcache: export backing_dev_name via sysfs Coly Li
2019-02-09 4:52 ` [PATCH 04/19] bcache: export backing_dev_uuid " Coly Li
2019-02-09 4:52 ` [PATCH 05/19] bcache: fix indentation issue, remove tabs on a hunk of code Coly Li
2019-02-09 4:52 ` [PATCH 06/19] bcache: treat stale && dirty keys as bad keys Coly Li
[not found] ` <20190212132825.E476F217D9@mail.kernel.org>
2019-02-12 16:42 ` Coly Li
2019-02-09 4:52 ` [PATCH 07/19] bcache: improve sysfs_strtoul_clamp() Coly Li
2019-02-09 4:53 ` [PATCH 08/19] bcache: fix input integer overflow of congested threshold Coly Li
2019-02-09 4:53 ` [PATCH 09/19] bcache: fix input overflow to sequential_cutoff Coly Li
2019-02-09 4:53 ` [PATCH 10/19] bcache: add sysfs_strtoul_bool() for setting bit-field variables Coly Li
2019-02-09 4:53 ` [PATCH 11/19] bcache: use sysfs_strtoul_bool() to set " Coly Li
2019-02-09 4:53 ` [PATCH 12/19] bcache: fix input overflow to writeback_delay Coly Li
2019-02-09 4:53 ` [PATCH 13/19] bcache: fix potential div-zero error of writeback_rate_i_term_inverse Coly Li
2019-02-09 4:53 ` [PATCH 14/19] bcache: fix potential div-zero error of writeback_rate_p_term_inverse Coly Li
2019-02-09 4:53 ` [PATCH 15/19] bcache: fix input overflow to writeback_rate_minimum Coly Li
2019-02-09 4:53 ` Coly Li [this message]
2019-02-09 4:53 ` [PATCH 17/19] bcache: fix input overflow to cache set io_error_limit Coly Li
2019-02-09 4:53 ` [PATCH 18/19] bcache: fix input overflow to cache set sysfs file io_error_halflife Coly Li
2019-02-09 4:53 ` [PATCH 19/19] bcache: use (REQ_META|REQ_PRIO) to indicate bio for metadata Coly Li
[not found] ` <20190212132824.1D1502084E@mail.kernel.org>
2019-02-12 16:48 ` Coly Li
2019-02-09 14:19 ` [PATCH 00/19] bcache patches for Linux v5.1 Jens Axboe
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