blktrace: fix integer parse

sscanf is a very poor way to parse integer. For example, I input
"discard" for act_mask, it gets 0xd and completely messes up. Using
correct API to do integer parse.

This patch also makes attributes accept any base of integer.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index bd8ae8d5ae9c..193c5f5e3f79 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1662,14 +1662,14 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
                 goto out;
 
         if (attr == &dev_attr_act_mask) {
-                if (sscanf(buf, "%llx", &value) != 1) {
+                if (kstrtoull(buf, 0, &value)) {
                         /* Assume it is a list of trace category names */
                         ret = blk_trace_str2mask(buf);
                         if (ret < 0)
                                 goto out;
                         value = ret;
                 }
-        } else if (sscanf(buf, "%llu", &value) != 1)
+        } else if (kstrtoull(buf, 0, &value))
                 goto out;
 
         ret = -ENXIO;