Linux kernel documentation tree maintained by Jonathan Corbet http://mirrors.hust.edu.cn/git/lwn.git/atom?h=master 2026-04-02T18:03:13+00:00 2026-04-02T18:03:13+00:00 Jakub Kicinski kuba@kernel.org 2026-04-02T17:57:09+00:00 urn:sha1:8ffb33d7709b59ff60560f48960a73bd8a55be95 Cross-merge networking fixes after downstream PR (net-7.0-rc7). Conflicts: net/vmw_vsock/af_vsock.c b18c83388874 ("vsock: initialize child_ns_mode_locked in vsock_net_init()") 0de607dc4fd8 ("vsock: add G2H fallback for CIDs not owned by H2G transport") Adjacent changes: drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c ceee35e5674a ("bnxt_en: Refactor some basic ring setup and adjustment logic") 57cdfe0dc70b ("bnxt_en: Resize RSS contexts on channel count change") drivers/net/wireless/intel/iwlwifi/mld/mac80211.c 4d56037a02bd ("wifi: iwlwifi: mld: block EMLSR during TDLS connections") 687a95d204e7 ("wifi: iwlwifi: mld: correctly set wifi generation data") drivers/net/wireless/intel/iwlwifi/mld/scan.h b6045c899e37 ("wifi: iwlwifi: mld: Refactor scan command handling") ec66ec6a5a8f ("wifi: iwlwifi: mld: Fix MLO scan timing") drivers/net/wireless/intel/iwlwifi/mvm/fw.c 078df640ef05 ("wifi: iwlwifi: mld: add support for iwl_mcc_allowed_ap_type_cmd v 2") 323156c3541e ("wifi: iwlwifi: mvm: don't send a 6E related command when not supported") Signed-off-by: Jakub Kicinski <kuba@kernel.org> 2026-04-01T03:10:48+00:00 Fernando Fernandez Mancera fmancera@suse.de 2026-03-30T12:10:33+00:00 urn:sha1:58e416e283284c15b8daf0b2b425f43242f62b0a IPv6 must be enabled or otherwise neigh_reduce() might cause a kernel panic. This was prevented by a check on in6_dev. Use ipv6_mod_enabled() instead as it is cleaner and also consistent with the code at route_shortcircuit(). Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://patch.msgid.link/20260330121033.4479-1-fmancera@suse.de Signed-off-by: Jakub Kicinski <kuba@kernel.org> 2026-03-29T18:21:23+00:00 Fernando Fernandez Mancera fmancera@suse.de 2026-03-25T12:08:47+00:00 urn:sha1:29ae61b2fe7eeafc921a1481230aac4431520418 As IPv6 is built-in only, the ipv6_stub infrastructure is no longer necessary. Convert all drivers currently utilizing ipv6_stub to make direct function calls. The fallback functions introduced previously will prevent linkage errors when CONFIG_IPV6 is disabled. Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de> Tested-by: Ricardo B. Marlière <rbm@suse.com> Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Antonio Quartulli <antonio@openvpn.net> Reviewed-by: Edward Cree <ecree.xilinx@gmail.com> Link: https://patch.msgid.link/20260325120928.15848-7-fmancera@suse.de Signed-off-by: Jakub Kicinski <kuba@kernel.org> 2026-03-28T03:37:14+00:00 Yang Yang n05ec@lzu.edu.cn 2026-03-26T03:44:41+00:00 urn:sha1:afa9a05e6c4971bd5586f1b304e14d61fb3d9385 vxlan_na_create() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address. Fixes: 4b29dba9c085 ("vxlan: fix nonfunctional neigh_reduce()") Cc: stable@vger.kernel.org Reported-by: Yifan Wu <yifanwucs@gmail.com> Reported-by: Juefei Pu <tomapufckgml@gmail.com> Tested-by: Ao Zhou <n05ec@lzu.edu.cn> Co-developed-by: Yuan Tan <tanyuan98@outlook.com> Signed-off-by: Yuan Tan <tanyuan98@outlook.com> Suggested-by: Xin Liu <bird@lzu.edu.cn> Signed-off-by: Yang Yang <n05ec@lzu.edu.cn> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Acked-by: Nikolay Aleksandrov <razor@blackwall.org> Link: https://patch.msgid.link/20260326034441.2037420-4-n05ec@lzu.edu.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org> 2026-03-05T15:52:56+00:00 Fernando Fernandez Mancera fmancera@suse.de 2026-03-04T12:03:57+00:00 urn:sha1:168ff39e4758897d2eee4756977d036d52884c7e When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which initializes it. If an IPv6 packet is injected into the interface, route_shortcircuit() is called and a NULL pointer dereference happens on neigh_lookup(). BUG: kernel NULL pointer dereference, address: 0000000000000380 Oops: Oops: 0000 [#1] SMP NOPTI [...] RIP: 0010:neigh_lookup+0x20/0x270 [...] Call Trace: <TASK> vxlan_xmit+0x638/0x1ef0 [vxlan] dev_hard_start_xmit+0x9e/0x2e0 __dev_queue_xmit+0xbee/0x14e0 packet_sendmsg+0x116f/0x1930 __sys_sendto+0x1f5/0x200 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x12f/0x1590 entry_SYSCALL_64_after_hwframe+0x76/0x7e Fix this by adding an early check on route_shortcircuit() when protocol is ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because VXLAN can be built-in even when IPv6 is built as a module. Fixes: e15a00aafa4b ("vxlan: add ipv6 route short circuit support") Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de> Link: https://patch.msgid.link/20260304120357.9778-2-fmancera@suse.de Signed-off-by: Jakub Kicinski <kuba@kernel.org> 2026-02-22T01:09:51+00:00 Linus Torvalds torvalds@linux-foundation.org 2026-02-22T00:37:42+00:00 urn:sha1:bf4afc53b77aeaa48b5409da5c8da6bb4eff7f43 This was done entirely with mindless brute force, using git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' | xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/' to convert the new alloc_obj() users that had a simple GFP_KERNEL argument to just drop that argument. Note that due to the extreme simplicity of the scripting, any slightly more complex cases spread over multiple lines would not be triggered: they definitely exist, but this covers the vast bulk of the cases, and the resulting diff is also then easier to check automatically. For the same reason the 'flex' versions will be done as a separate conversion. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2026-02-21T09:02:28+00:00 Kees Cook kees@kernel.org 2026-02-21T07:49:23+00:00 urn:sha1:69050f8d6d075dc01af7a5f2f550a8067510366f This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook <kees@kernel.org> 2026-01-25T21:14:11+00:00 David Yang mmyangfl@gmail.com 2026-01-20T09:21:32+00:00 urn:sha1:58d4ca5b69947c9d8ee197095e6c1c3b5c078716 On 64bit arches, struct u64_stats_sync is empty and provides no help against load/store tearing. memcpy() should not be considered atomic against u64 values. Use u64_stats_copy() instead. Signed-off-by: David Yang <mmyangfl@gmail.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://patch.msgid.link/20260120092137.2161162-5-mmyangfl@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> 2026-01-23T19:31:14+00:00 Paolo Abeni pabeni@redhat.com 2026-01-21T16:11:29+00:00 urn:sha1:e0b73b5a925739bee16ef3b0a1212a79fafc8050 Similar to the previous patch, reuse the same helpers to add tunnel GSO partial capabilities to vxlan devices. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Link: https://patch.msgid.link/93d916c11b3a790a8bfccad77d9e85ee6e533042.1769011015.git.pabeni@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> 2025-12-02T23:37:53+00:00 Jakub Kicinski kuba@kernel.org 2025-12-02T23:37:48+00:00 urn:sha1:4de44542991ed4cb8c9fb2ccd766d6e6015101b0 Merge in late fixes in preparation for the net-next PR. Signed-off-by: Jakub Kicinski <kuba@kernel.org>