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bcache: Fix an error code in bch_dump_read()

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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: cafe563591 ("bcache: A block layer cache")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dan Carpenter 2019-09-03 21:25:44 +08:00 committed by Jens Axboe
parent d55a4ae9e1
commit d66c9920c0
1 changed files with 2 additions and 3 deletions
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5
drivers/md/bcache/debug.c
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@ -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;