This is a note to let you know that I've just added the patch titled
RDMA/ucma: Fix use-after-free access in ucma_close
to the 4.15-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:
rdma-ucma-fix-use-after-free-access-in-ucma_close.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ed65a4dc22083e73bac599ded6a262318cad7baf Mon Sep 17 00:00:00 2001
From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Date: Mon, 19 Mar 2018 14:20:15 +0200
Subject: RDMA/ucma: Fix use-after-free access in ucma_close
From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
commit ed65a4dc22083e73bac599ded6a262318cad7baf upstream.
The error in ucma_create_id() left ctx in the list of contexts belong
to ucma file descriptor. The attempt to close this file descriptor causes
to use-after-free accesses while iterating over such list.
Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace")
Reported-by: <syzbot+dcfd344365a56fbebd0f@xxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Reviewed-by: Sean Hefty <sean.hefty@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/ucma.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -497,6 +497,9 @@ err1:
mutex_lock(&mut);
idr_remove(&ctx_idr, ctx->id);
mutex_unlock(&mut);
+ mutex_lock(&file->mut);
+ list_del(&ctx->list);
+ mutex_unlock(&file->mut);
kfree(ctx);
return ret;
}
Patches currently in stable-queue which might be from leonro@xxxxxxxxxxxx are
queue-4.15/rdma-ucma-check-af-family-prior-resolving-address.patch
queue-4.15/rdma-ucma-check-that-device-is-connected-prior-to-access-it.patch
queue-4.15/rdma-ucma-fix-use-after-free-access-in-ucma_close.patch
queue-4.15/rdma-ucma-ensure-that-cm_id-exists-prior-to-access-it.patch
queue-4.15/rdma-ucma-check-that-device-exists-prior-to-accessing-it.patch