This is a note to let you know that I've just added the patch titled
RDMA/uverbs: Check for null return of kmalloc_array
to the 5.15-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-uverbs-check-for-null-return-of-kmalloc_array.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7694a7de22c53a312ea98960fcafc6ec62046531 Mon Sep 17 00:00:00 2001
From: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
Date: Fri, 31 Dec 2021 17:33:15 +0800
Subject: RDMA/uverbs: Check for null return of kmalloc_array
From: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
commit 7694a7de22c53a312ea98960fcafc6ec62046531 upstream.
Because of the possible failure of the allocation, data might be NULL
pointer and will cause the dereference of the NULL pointer later.
Therefore, it might be better to check it and return -ENOMEM.
Fixes: 6884c6c4bd09 ("RDMA/verbs: Store the write/write_ex uapi entry points in the uverbs_api")
Link: https://lore.kernel.org/r/20211231093315.1917667-1-jiasheng@xxxxxxxxxxx
Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/uverbs_uapi.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/infiniband/core/uverbs_uapi.c
+++ b/drivers/infiniband/core/uverbs_uapi.c
@@ -447,6 +447,9 @@ static int uapi_finalize(struct uverbs_a
uapi->num_write_ex = max_write_ex + 1;
data = kmalloc_array(uapi->num_write + uapi->num_write_ex,
sizeof(*uapi->write_methods), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
for (i = 0; i != uapi->num_write + uapi->num_write_ex; i++)
data[i] = &uapi->notsupp_method;
uapi->write_methods = data;
Patches currently in stable-queue which might be from jiasheng@xxxxxxxxxxx are
queue-5.15/rdma-uverbs-check-for-null-return-of-kmalloc_array.patch
