X-Git-Url: http://git.ipfire.org/?a=blobdiff_plain;f=block%2Fblk-mq-sysfs.c;h=c97fafa1b2062b830bb5ee70d0999e32b540f1da;hb=972998788aae86e12338f3b750984ad135ffac7a;hp=79969c3c234fd9db3f76f2186d3f7080e9f1e321;hpb=a82256bc026722800d1fdeca5521f1ba487bc2ef;p=people%2Farne_f%2Fkernel.git

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 79969c3c234fd..c97fafa1b2062 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -145,20 +145,25 @@ static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
 
 static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
 {
+	const size_t size = PAGE_SIZE - 1;
 	unsigned int i, first = 1;
-	ssize_t ret = 0;
+	int ret = 0, pos = 0;
 
 	for_each_cpu(i, hctx->cpumask) {
 		if (first)
-			ret += sprintf(ret + page, "%u", i);
+			ret = snprintf(pos + page, size - pos, "%u", i);
 		else
-			ret += sprintf(ret + page, ", %u", i);
+			ret = snprintf(pos + page, size - pos, ", %u", i);
+
+		if (ret >= size - pos)
+			break;
 
 		first = 0;
+		pos += ret;
 	}
 
-	ret += sprintf(ret + page, "\n");
-	return ret;
+	ret = snprintf(pos + page, size + 1 - pos, "\n");
+	return pos + ret;
 }
 
 static struct attribute *default_ctx_attrs[] = {