From: Coly Li <colyli@suse.de>
To: linux-bcache@vger.kernel.org
Cc: linux-block@vger.kernel.org, Coly Li <colyli@suse.de>
Subject: [PATCH 09/11] bcache: fix input overflow to journal_delay_ms
Date: Sun, 23 Dec 2018 19:09:35 +0800 [thread overview]
Message-ID: <20181223110937.11559-10-colyli@suse.de> (raw)
In-Reply-To: <20181223110937.11559-1-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 31e41cc3c162..032d108d3041 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -809,7 +809,9 @@ 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:[~2018-12-23 11:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-23 11:09 [PATCH 00/11] fixes for setting values via sysfs interface Coly Li
2018-12-23 11:09 ` [PATCH 01/11] bcache: fix input integer overflow of congested threshold Coly Li
2018-12-23 11:09 ` [PATCH 02/11] bcache: fix input overflow to sequential_cutoff Coly Li
2018-12-23 11:09 ` [PATCH 03/11] bcache: add sysfs_strtoul_bool() for setting bit-field variables Coly Li
2018-12-23 11:09 ` [PATCH 04/11] bcache: use sysfs_strtoul_bool() to set " Coly Li
2018-12-23 11:09 ` [PATCH 05/11] bcache: fix input overflow to writeback_delay Coly Li
2018-12-23 11:09 ` [PATCH 06/11] bcache: fix potential div-zero error of writeback_rate_i_term_inverse Coly Li
2018-12-23 11:09 ` [PATCH 07/11] bcache: fix potential div-zero error of writeback_rate_p_term_inverse Coly Li
2018-12-23 11:09 ` [PATCH 08/11] bcache: fix input overflow to writeback_rate_minimum Coly Li
2018-12-23 11:09 ` Coly Li [this message]
2018-12-23 11:09 ` [PATCH 10/11] bcache: fix input overflow to cache set io_error_limit Coly Li
2018-12-23 11:09 ` [PATCH 11/11] bcache: fix input overflow to cache set sysfs file io_error_halflife Coly Li
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