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bcachefs: Fix copy_to_user() usage in flush_buf()

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copy_to_user() returns the number of bytes successfully copied - not an
errcode.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-09-19 17:09:22 -04:00
parent 3e55189b50
commit f7f6943a8c
1 changed files with 8 additions and 8 deletions
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16
fs/bcachefs/debug.c
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@ -319,16 +319,16 @@ static ssize_t flush_buf(struct dump_iter *i)
{
if (i->buf.pos) {
size_t bytes = min_t(size_t, i->buf.pos, i->size);
int err = copy_to_user(i->ubuf, i->buf.buf, bytes);
int copied = bytes - copy_to_user(i->ubuf, i->buf.buf, bytes);
if (err)
return err;
i->ret += copied;
i->ubuf += copied;
i->size -= copied;
i->buf.pos -= copied;
memmove(i->buf.buf, i->buf.buf + copied, i->buf.pos);
i->ret += bytes;
i->ubuf += bytes;
i->size -= bytes;
i->buf.pos -= bytes;
memmove(i->buf.buf, i->buf.buf + bytes, i->buf.pos);
if (copied != bytes)
return -EFAULT;
}
return i->size ? 0 : i->ret;