linux-cve-announce - CVE-2022-50885: RDMA/rxe: Fix NULL-ptr-deref in rxe_qp_do

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Message-ID: <2025123020-CVE-2022-50885-c207@gregkh>
Date: Tue, 30 Dec 2025 13:34:20 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50885: RDMA/rxe: Fix NULL-ptr-deref in rxe_qp_do_cleanup() when socket create failed

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

RDMA/rxe: Fix NULL-ptr-deref in rxe_qp_do_cleanup() when socket create failed

There is a null-ptr-deref when mount.cifs over rdma:

  BUG: KASAN: null-ptr-deref in rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe]
  Read of size 8 at addr 0000000000000018 by task mount.cifs/3046

  CPU: 2 PID: 3046 Comm: mount.cifs Not tainted 6.1.0-rc5+ #62
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc3
  Call Trace:
   <TASK>
   dump_stack_lvl+0x34/0x44
   kasan_report+0xad/0x130
   rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe]
   execute_in_process_context+0x25/0x90
   __rxe_cleanup+0x101/0x1d0 [rdma_rxe]
   rxe_create_qp+0x16a/0x180 [rdma_rxe]
   create_qp.part.0+0x27d/0x340
   ib_create_qp_kernel+0x73/0x160
   rdma_create_qp+0x100/0x230
   _smbd_get_connection+0x752/0x20f0
   smbd_get_connection+0x21/0x40
   cifs_get_tcp_session+0x8ef/0xda0
   mount_get_conns+0x60/0x750
   cifs_mount+0x103/0xd00
   cifs_smb3_do_mount+0x1dd/0xcb0
   smb3_get_tree+0x1d5/0x300
   vfs_get_tree+0x41/0xf0
   path_mount+0x9b3/0xdd0
   __x64_sys_mount+0x190/0x1d0
   do_syscall_64+0x35/0x80
   entry_SYSCALL_64_after_hwframe+0x46/0xb0

The root cause of the issue is the socket create failed in
rxe_qp_init_req().

So move the reset rxe_qp_do_cleanup() after the NULL ptr check.

The Linux kernel CVE team has assigned CVE-2022-50885 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 4.14.303 with commit ee24de095569935eba600f7735e8e8ddea5b418e
	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 4.19.270 with commit 7340ca9f782be6fbe3f64a134dc112772764f766
	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 5.4.229 with commit bd7106a6004f1077a365ca7f5a99c7a708e20714
	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 5.10.163 with commit 6bb5a62bfd624039b05157745c234068508393a9
	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 5.15.86 with commit f64f08b9e6fb305a25dd75329e06ae342b9ce336
	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 6.0.16 with commit 5b924632d84a60bc0c7fe6e9bbbce99d03908957
	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 6.1.2 with commit 821f9a18210f6b9fd6792471714c799607b25db4
	Issue introduced in 4.8 with commit 8700e3e7c4857d28ebaa824509934556da0b3e76 and fixed in 6.2 with commit f67376d801499f4fa0838c18c1efcad8840e550d

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-50885
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/infiniband/sw/rxe/rxe_qp.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/ee24de095569935eba600f7735e8e8ddea5b418e
	https://git.kernel.org/stable/c/7340ca9f782be6fbe3f64a134dc112772764f766
	https://git.kernel.org/stable/c/bd7106a6004f1077a365ca7f5a99c7a708e20714
	https://git.kernel.org/stable/c/6bb5a62bfd624039b05157745c234068508393a9
	https://git.kernel.org/stable/c/f64f08b9e6fb305a25dd75329e06ae342b9ce336
	https://git.kernel.org/stable/c/5b924632d84a60bc0c7fe6e9bbbce99d03908957
	https://git.kernel.org/stable/c/821f9a18210f6b9fd6792471714c799607b25db4
	https://git.kernel.org/stable/c/f67376d801499f4fa0838c18c1efcad8840e550d