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Haixia Qu 3998283e4c tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer 
[ Upstream commit f82727adcf ]

The reproduction steps:
1. create a tun interface
2. enable l2 bearer
3. TIPC_NL_UDP_GET_REMOTEIP with media name set to tun

tipc: Started in network mode
tipc: Node identity 8af312d38a21, cluster identity 4711
tipc: Enabled bearer <eth:syz_tun>, priority 1
Oops: general protection fault
KASAN: null-ptr-deref in range
CPU: 1 UID: 1000 PID: 559 Comm: poc Not tainted 6.16.0-rc1+ #117 PREEMPT
Hardware name: QEMU Ubuntu 24.04 PC
RIP: 0010:tipc_udp_nl_dump_remoteip+0x4a4/0x8f0

the ub was in fact a struct dev.

when bid != 0 && skip_cnt != 0, bearer_list[bid] may be NULL or
other media when other thread changes it.

fix this by checking media_id.

Fixes: 832629ca5c ("tipc: add UDP remoteip dump to netlink API")
Signed-off-by: Haixia Qu <hxqu@hillstonenet.com>
Reviewed-by: Tung Nguyen <tung.quang.nguyen@est.tech>
Link: https://patch.msgid.link/20250617055624.2680-1-hxqu@hillstonenet.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-06-27 11:02:57 +01:00
arch Revert "x86/bugs: Make spectre user default depend on MITIGATION_SPECTRE_V2" on v6.6 and older 2025-06-27 11:02:56 +01:00
block block: fix 'kmem_cache of name 'bio-108' already exists' 2025-04-10 14:29:37 +02:00
certs
crypto crypto: algif_hash - fix double free in hash_accept 2025-06-04 14:32:35 +02:00
Documentation Revert "x86/bugs: Make spectre user default depend on MITIGATION_SPECTRE_V2" on v6.6 and older 2025-06-27 11:02:56 +01:00
drivers atm: atmtcp: Free invalid length skb in atmtcp_c_send(). 2025-06-27 11:02:57 +01:00
fs jffs2: check jffs2_prealloc_raw_node_refs() result in few other places 2025-06-27 11:02:56 +01:00
include erofs: remove unused trace event erofs_destroy_inode 2025-06-27 11:02:57 +01:00
init sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG_SMP 2025-05-02 07:39:28 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:02:52 +01:00
kernel ftrace: Fix UAF when lookup kallsym after ftrace disabled 2025-06-27 11:02:52 +01:00
lib dql: Fix dql->limit value when reset. 2025-06-04 14:32:30 +02:00
LICENSES
mm mm: fix ratelimit_pages update error in dirty_ratio_handler() 2025-06-27 11:02:52 +01:00
net tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer 2025-06-27 11:02:57 +01:00
samples
scripts kbuild: fix argument parsing in scripts/config 2025-06-04 14:32:31 +02:00
security selinux: fix selinux_xfrm_alloc_user() to set correct ctx_len 2025-06-27 11:02:56 +01:00
sound ALSA: hda/realtek: enable headset mic on Latitude 5420 Rugged 2025-06-27 11:02:56 +01:00
tools perf record: Fix incorrect --user-regs comments 2025-06-27 11:02:48 +01:00
usr
virt
.clang-format
.cocciconfig
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COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS platform: Add Surface platform directory 2025-06-27 11:02:56 +01:00
Makefile Linux 5.4.294 2025-06-04 14:32:37 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.