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

commit d2c9be89f8ebe7ebcc97676ac40f8dec1cf9b43a upstream.

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>
Cc: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-colors
Ming Lei 2019-11-04 16:26:53 +08:00 committed by Greg Kroah-Hartman
parent 62f4e8015e
commit e13c3c2196
1 changed files with 1 additions and 1 deletions
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2
block/blk-mq-sysfs.c
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@ -183,7 +183,7 @@ 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;
}