)]}'
{
  "commit": "af77647801b2e50e050f1d0d67bdd75a965cea40",
  "tree": "1914e7bf123d2927ff93e0f2f36723020f5657fa",
  "parents": [
    "66d5864ed67763a0b169c314a5abac591c5c8fcf"
  ],
  "author": {
    "name": "Kuniyuki Iwashima",
    "email": "kuniyu@google.com",
    "time": "Tue Sep 09 23:26:12 2025 +0000"
  },
  "committer": {
    "name": "Miri Amarilio",
    "email": "mirilio@google.com",
    "time": "Wed Oct 01 12:01:28 2025 -0700"
  },
  "message": "tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock-\u003ecork.\n\n[ Upstream commit a3967baad4d533dc254c31e0d221e51c8d223d58 ]\n\nsyzbot reported the splat below. [0]\n\nThe repro does the following:\n\n  1. Load a sk_msg prog that calls bpf_msg_cork_bytes(msg, cork_bytes)\n  2. Attach the prog to a SOCKMAP\n  3. Add a socket to the SOCKMAP\n  4. Activate fault injection\n  5. Send data less than cork_bytes\n\nAt 5., the data is carried over to the next sendmsg() as it is\nsmaller than the cork_bytes specified by bpf_msg_cork_bytes().\n\nThen, tcp_bpf_send_verdict() tries to allocate psock-\u003ecork to hold\nthe data, but this fails silently due to fault injection + __GFP_NOWARN.\n\nIf the allocation fails, we need to revert the sk-\u003esk_forward_alloc\nchange done by sk_msg_alloc().\n\nLet\u0027s call sk_msg_free() when tcp_bpf_send_verdict fails to allocate\npsock-\u003ecork.\n\nThe \"*copied\" also needs to be updated such that a proper error can\nbe returned to the caller, sendmsg. It fails to allocate psock-\u003ecork.\nNothing has been corked so far, so this patch simply sets \"*copied\"\nto 0.\n\n[0]:\nWARNING: net/ipv4/af_inet.c:156 at inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156, CPU#1: syz-executor/5983\nModules linked in:\nCPU: 1 UID: 0 PID: 5983 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025\nRIP: 0010:inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156\nCode: 0f 0b 90 e9 62 fe ff ff e8 7a db b5 f7 90 0f 0b 90 e9 95 fe ff ff e8 6c db b5 f7 90 0f 0b 90 e9 bb fe ff ff e8 5e db b5 f7 90 \u003c0f\u003e 0b 90 e9 e1 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 9f fc\nRSP: 0018:ffffc90000a08b48 EFLAGS: 00010246\nRAX: ffffffff8a09d0b2 RBX: dffffc0000000000 RCX: ffff888024a23c80\nRDX: 0000000000000100 RSI: 0000000000000fff RDI: 0000000000000000\nRBP: 0000000000000fff R08: ffff88807e07c627 R09: 1ffff1100fc0f8c4\nR10: dffffc0000000000 R11: ffffed100fc0f8c5 R12: ffff88807e07c380\nR13: dffffc0000000000 R14: ffff88807e07c60c R15: 1ffff1100fc0f872\nFS:  00005555604c4500(0000) GS:ffff888125af1000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00005555604df5c8 CR3: 0000000032b06000 CR4: 00000000003526f0\nCall Trace:\n \u003cIRQ\u003e\n __sk_destruct+0x86/0x660 net/core/sock.c:2339\n rcu_do_batch kernel/rcu/tree.c:2605 [inline]\n rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861\n handle_softirqs+0x286/0x870 kernel/softirq.c:579\n __do_softirq kernel/softirq.c:613 [inline]\n invoke_softirq kernel/softirq.c:453 [inline]\n __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:696\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]\n sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052\n \u003c/IRQ\u003e\n\nBUG\u003db/448602345\nTEST\u003dpresubmit\nRELEASE_NOTE\u003dFixed CVE-2025-39913 in the Linux kernel.\n\ncos-patch: security-moderate\nFixes: 4f738adba30a (\"bpf: create tcp_bpf_ulp allowing BPF to monitor socket TX/RX data\")\nReported-by: syzbot+4cabd1d2fa917a456db8@syzkaller.appspotmail.com\nCloses: https://lore.kernel.org/netdev/68c0b6b5.050a0220.3c6139.0013.GAE@google.com/\nChange-Id: Ic6bfa42025fd36d2dcc0b0f003e678eba7dfac8a\nSigned-off-by: Kuniyuki Iwashima \u003ckuniyu@google.com\u003e\nSigned-off-by: Martin KaFai Lau \u003cmartin.lau@kernel.org\u003e\nLink: https://patch.msgid.link/20250909232623.4151337-1-kuniyu@google.com\nSigned-off-by: Sasha Levin \u003csashal@kernel.org\u003e\nSigned-off-by: Kernel CVE Triage Automation \u003ccloud-image-kernel-cve-triage-automation@prod.google.com\u003e\nReviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/113082\nTested-by: Cusky Presubmit Bot \u003cpresubmit@cos-infra-prod.iam.gserviceaccount.com\u003e\nReviewed-by: Kevin Berry \u003ckpberry@google.com\u003e\nReviewed-by: Miri Amarilio \u003cmirilio@google.com\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "5312237e80409312ad780c90ae0eb366bfd92b31",
      "old_mode": 33188,
      "old_path": "net/ipv4/tcp_bpf.c",
      "new_id": "7518d2af630880ee0d3c40c2825f023224f26d73",
      "new_mode": 33188,
      "new_path": "net/ipv4/tcp_bpf.c"
    }
  ]
}