Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 23/28] Dont feed anything but regular iovecs to blk_rq_map_user_iov | Date | Fri, 9 Dec 2016 17:18:05 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Linus Torvalds <torvalds@linux-foundation.org>
commit a0ac402cfcdc904f9772e1762b3fda112dcc56a0 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>
--- block/blk-map.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/block/blk-map.c +++ b/block/blk-map.c @@ -90,6 +90,9 @@ int blk_rq_map_user_iov(struct request_q 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;
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