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Don't feed anything but regular iovec's to blk_rq_map_user_iov

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commit a0ac402cfc upstream.

In theory we could map other things, but there's a reason that function
is called "user_iov".  Using anything else (like splice can do) just
confuses it.

Reported-and-tested-by: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Torvalds
2016-12-06 16:18:14 -08:00
committed by Greg Kroah-Hartman
parent fd1aa12c63
commit d41fb2fbb2
1 changed files with 3 additions and 0 deletions
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3
block/blk-map.c
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@@ -90,6 +90,9 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
if (!iter || !iter->count)
return -EINVAL;
if (!iter_is_iovec(iter))
return -EINVAL;
iov_for_each(iov, i, *iter) {
unsigned long uaddr = (unsigned long) iov.iov_base;