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37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
From 451a2886b6bf90e2fb378f7c46c655450fb96e81 Mon Sep 17 00:00:00 2001
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From: Al Viro <viro@zeniv.linux.org.uk>
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Date: Sat, 21 Mar 2015 20:08:18 -0400
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Subject: sg_start_req(): make sure that there's not too many elements in iovec
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unfortunately, allowing an arbitrary 16bit value means a possibility of
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overflow in the calculation of total number of pages in bio_map_user_iov() -
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we rely on there being no more than PAGE_SIZE members of sum in the
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first loop there. If that sum wraps around, we end up allocating
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too small array of pointers to pages and it's easy to overflow it in
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the second loop.
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X-Coverup: TINC (and there's no lumber cartel either)
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Cc: stable@vger.kernel.org # way, way back
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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---
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drivers/scsi/sg.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
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index d383f84..b5a4db8 100644
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--- a/drivers/scsi/sg.c
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+++ b/drivers/scsi/sg.c
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@@ -1744,6 +1744,9 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
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md->from_user = 0;
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}
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+ if (unlikely(iov_count > MAX_UIOVEC))
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+ return -EINVAL;
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+
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if (iov_count) {
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int size = sizeof(struct iovec) * iov_count;
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struct iovec *iov;
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--
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cgit v1.1
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