X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=fs%2Fsysfs%2Ffile.c;h=f35523d4fa3a6d657260e7b04d5273db2dcd53b1;hb=ae36ce07abbdde3521dc0ef7e32143b88718cd21;hp=6c95628ea377dc0d4c07cbb7979f2a280dd3e6a8;hpb=8c4de9bc2041229fb778e0c47e32585b6f6b1d09;p=firefly-linux-kernel-4.4.55.git

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 */