From d66c9920c0cf984cf99cab5036fd5f3a1b7fba46 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 3 Sep 2019 21:25:44 +0800 Subject: [PATCH] bcache: Fix an error code in bch_dump_read() The copy_to_user() function returns the number of bytes remaining to be copied, but the intention here was to return -EFAULT if the copy fails. Fixes: cafe56359144 ("bcache: A block layer cache") Signed-off-by: Dan Carpenter Signed-off-by: Coly Li Signed-off-by: Jens Axboe --- drivers/md/bcache/debug.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c index 8b123be05254..336f43910383 100644 --- a/drivers/md/bcache/debug.c +++ b/drivers/md/bcache/debug.c @@ -178,10 +178,9 @@ static ssize_t bch_dump_read(struct file *file, char __user *buf, while (size) { struct keybuf_key *w; unsigned int bytes = min(i->bytes, size); - int err = copy_to_user(buf, i->buf, bytes); - if (err) - return err; + if (copy_to_user(buf, i->buf, bytes)) + return -EFAULT; ret += bytes; buf += bytes; -- 2.30.2