From: Ming Lei <ming.lei@redhat.com>
Date: Mon, 4 Nov 2019 08:26:53 +0000 (+0800)
Subject: blk-mq: make sure that line break can be printed
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d2c9be89f8ebe7ebcc97676ac40f8dec1cf9b43a;p=openwrt%2Fstaging%2Fblogic.git

blk-mq: make sure that line break can be printed

8962842ca5ab ("blk-mq: avoid sysfs buffer overflow with too many CPU cores")
avoids sysfs buffer overflow, and reserves one character for line break.
However, the last snprintf() doesn't get correct 'size' parameter passed
in, so fixed it.

Fixes: 8962842ca5ab ("blk-mq: avoid sysfs buffer overflow with too many CPU cores")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 4caa56d1bc85..062229395a50 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -175,7 +175,7 @@ static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
 		pos += ret;
 	}
 
-	ret = snprintf(pos + page, size - pos, "\n");
+	ret = snprintf(pos + page, size + 1 - pos, "\n");
 	return pos + ret;
 }