Re: [PATCH bpf v4] bpf: Fix UAF due to concurrent consumption of ttrace lists in alloc_bulk

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@xxxxxxxxxx>:

On Sat,  5 Sep 2026 02:11:39 +0000 you wrote:
> From: Pu Lehui <pulehui@xxxxxxxxxx>
> 
> Syzkaller repeatedly triggered UAF splats related to nodes in
> waiting_for_gp_ttrace within the bpf memalloc:
> 
> BUG: KASAN: slab-use-after-free in llist_del_first+0x85/0x110 lib/llist.c:61
> Read of size 8 at addr ffff8881572cd080 by task syz.4.470/5112
>  ...
>  llist_del_first+0x85/0x110 lib/llist.c:61
>  alloc_bulk+0x193/0x460 kernel/bpf/memalloc.c:229
>  bpf_mem_refill+0x386/0x560 kernel/bpf/memalloc.c:436
> 
> [...]

Here is the summary with links:
  - [bpf,v4] bpf: Fix UAF due to concurrent consumption of ttrace lists in alloc_bulk
    https://git.kernel.org/bpf/bpf/c/1c21452d02ee

You are awesome, thank you!
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