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authorColy Li <colyli@suse.de>2019-02-09 12:53:07 +0800
committerJens Axboe <axboe@kernel.dk>2019-02-09 07:18:32 -0700
commitdab71b2db98dcdd4657d151b01a7be88ce10f9d1 (patch)
treea396e301c99ef2770c9725493a86f4257bef9f52 /drivers/md
parent5b5fd3c94eef69dcfaa8648198e54c92e5687d6d (diff)
bcache: fix input overflow to writeback_rate_minimum
dc->writeback_rate_minimum is type unsigned integer variable, it is set via sysfs interface, and converte from input string to unsigned integer by d_strtoul_nonzero(). When the converted input value is larger than UINT_MAX, overflow to unsigned integer happens. This patch fixes the overflow by using sysfs_strotoul_clamp() to convert input string and limit the value in range [1, UINT_MAX], then the overflow can be avoided. 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.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index c6677c93e368..d292eb757ac4 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -308,7 +308,9 @@ STORE(__cached_dev)
sysfs_strtoul_clamp(writeback_rate_p_term_inverse,
dc->writeback_rate_p_term_inverse,
1, UINT_MAX);
- d_strtoul_nonzero(writeback_rate_minimum);
+ sysfs_strtoul_clamp(writeback_rate_minimum,
+ dc->writeback_rate_minimum,
+ 1, UINT_MAX);
sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX);