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-rw-r--r--fs/sysfs/file.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 6c95628ea377..f35523d4fa3a 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -108,6 +108,7 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
{
const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
struct kobject *kobj = of->kn->parent->priv;
+ size_t len;
/*
* If buf != of->prealloc_buf, we don't know how
@@ -115,7 +116,8 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
*/
if (pos || WARN_ON_ONCE(buf != of->prealloc_buf))
return 0;
- return ops->show(kobj, of->kn->priv, buf);
+ len = ops->show(kobj, of->kn->priv, buf);
+ return min(count, len);
}
/* kernfs write callback for regular sysfs files */