[PATCH 14/19] bcache: Correct return value for sysfs attach errors

bcache
2017-06-30T20:43:58Z

From: Tony Asleson <tasleson@redhat.com>

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
---
drivers/md/bcache/sysfs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index cc0076d..7579ca6 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -206,7 +206,7 @@ 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;
unsigned ioprio_class = 0; /* invalid initial ioprio values */
@@ -245,7 +245,7 @@ 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;
--
1.8.3.1