This is a note to let you know that I've just added the patch titled
IB/core: disallow registering 0-sized memory region
to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-core-disallow-registering-0-sized-memory-region.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 8abaae62f3fdead8f4ce0ab46b4ab93dee39bab2 Mon Sep 17 00:00:00 2001
From: Yann Droneaud <[email protected]>
Date: Mon, 13 Apr 2015 14:56:22 +0200
Subject: IB/core: disallow registering 0-sized memory region
From: Yann Droneaud <[email protected]>
commit 8abaae62f3fdead8f4ce0ab46b4ab93dee39bab2 upstream.
If ib_umem_get() is called with a size equal to 0 and an
non-page aligned address, one page will be pinned and a
0-sized umem will be returned to the caller.
This should not be allowed: it's not expected for a memory
region to have a size equal to 0.
This patch adds a check to explicitly refuse to register
a 0-sized region.
Link: http://mid.gmane.org/[email protected]
Cc: Shachar Raindel <[email protected]>
Cc: Jack Morgenstein <[email protected]>
Cc: Or Gerlitz <[email protected]>
Signed-off-by: Yann Droneaud <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/infiniband/core/umem.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -99,6 +99,9 @@ struct ib_umem *ib_umem_get(struct ib_uc
if (dmasync)
dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
+ if (!size)
+ return ERR_PTR(-EINVAL);
+
/*
* If the combination of the addr and size requested for this memory
* region causes an integer overflow, return error.
Patches currently in stable-queue which might be from [email protected] are
queue-4.0/perf-tools-work-around-lack-of-sched_getcpu-in-glibc-2.6.patch
queue-4.0/ib-core-don-t-disallow-registering-region-starting-at-0x0.patch
queue-4.0/ib-core-disallow-registering-0-sized-memory-region.patch
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