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40 lines
1.2 KiB
Diff
40 lines
1.2 KiB
Diff
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From a0ac402cfcdc904f9772e1762b3fda112dcc56a0 Mon Sep 17 00:00:00 2001
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From: Linus Torvalds <torvalds@linux-foundation.org>
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Date: Tue, 6 Dec 2016 16:18:14 -0800
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Subject: [PATCH] Don't feed anything but regular iovec's to
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blk_rq_map_user_iov
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In theory we could map other things, but there's a reason that function
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is called "user_iov". Using anything else (like splice can do) just
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confuses it.
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Reported-and-tested-by: Johannes Thumshirn <jthumshirn@suse.de>
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Cc: Al Viro <viro@ZenIV.linux.org.uk>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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---
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block/blk-map.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/block/blk-map.c b/block/blk-map.c
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index b8657fa8dc9af..27fd8d92892d4 100644
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--- a/block/blk-map.c
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+++ b/block/blk-map.c
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@@ -118,6 +118,9 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
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struct iov_iter i;
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int ret;
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+ if (!iter_is_iovec(iter))
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+ goto fail;
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+
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if (map_data)
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copy = true;
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else if (iov_iter_alignment(iter) & align)
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@@ -140,6 +143,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
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unmap_rq:
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__blk_rq_unmap_user(bio);
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+fail:
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rq->bio = NULL;
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return -EINVAL;
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}
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