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authorTony Asleson <tasleson@redhat.com>2017-09-06 14:25:57 +0800
committerJens Axboe <axboe@kernel.dk>2017-09-06 08:17:33 -0600
commit77fa100f27475d08a569b9d51c17722130f089e7 (patch)
treef4407063000718a982fe1f5438c4cb91e776cb9f /drivers/md
parenta8394090a9129b40f9d90dcb7f4a49d60c727ca6 (diff)
downloadlinux-77fa100f27475d08a569b9d51c17722130f089e7.tar.bz2
bcache: Correct return value for sysfs attach errors
If you encounter any errors in bch_cached_dev_attach it will return a negative error code. The variable 'v' which stores the result is unsigned, thus user space sees a very large value returned for bytes written which can cause incorrect user space behavior. Utilize 1 signed variable to use throughout the function to preserve error return capability. Signed-off-by: Tony Asleson <tasleson@redhat.com> Acked-by: Coly Li <colyli@suse.de> Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bcache/sysfs.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 09295c07ea88..104c57cd666c 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -192,7 +192,7 @@ STORE(__cached_dev)
{
struct cached_dev *dc = container_of(kobj, struct cached_dev,
disk.kobj);
- unsigned v = size;
+ ssize_t v = size;
struct cache_set *c;
struct kobj_uevent_env *env;
@@ -227,7 +227,7 @@ STORE(__cached_dev)
bch_cached_dev_run(dc);
if (attr == &sysfs_cache_mode) {
- ssize_t v = bch_read_string_list(buf, bch_cache_modes + 1);
+ v = bch_read_string_list(buf, bch_cache_modes + 1);
if (v < 0)
return v;