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 <stable@xxxxxxxxxxxxxxx> know about it. >From 8abaae62f3fdead8f4ce0ab46b4ab93dee39bab2 Mon Sep 17 00:00:00 2001 From: Yann Droneaud <ydroneaud@xxxxxxxxxx> Date: Mon, 13 Apr 2015 14:56:22 +0200 Subject: IB/core: disallow registering 0-sized memory region From: Yann Droneaud <ydroneaud@xxxxxxxxxx> 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/cover.1428929103.git.ydroneaud@xxxxxxxxxx Cc: Shachar Raindel <raindel@xxxxxxxxxxxx> Cc: Jack Morgenstein <jackm@xxxxxxxxxxxx> Cc: Or Gerlitz <ogerlitz@xxxxxxxxxxxx> Signed-off-by: Yann Droneaud <ydroneaud@xxxxxxxxxx> Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 ydroneaud@xxxxxxxxxx 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 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html