Re: [PATCH net v2] page_pool: Fix use-after-free in page_pool_recycle_in_ring

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Tue, 27 May 2025 19:41:52 +0800 you wrote:
> syzbot reported a uaf in page_pool_recycle_in_ring:
> 
> BUG: KASAN: slab-use-after-free in lock_release+0x151/0xa30 kernel/locking/lockdep.c:5862
> Read of size 8 at addr ffff8880286045a0 by task syz.0.284/6943
> 
> CPU: 0 UID: 0 PID: 6943 Comm: syz.0.284 Not tainted 6.13.0-rc3-syzkaller-gdfa94ce54f41 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:94 [inline]
>  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
>  print_address_description mm/kasan/report.c:378 [inline]
>  print_report+0x169/0x550 mm/kasan/report.c:489
>  kasan_report+0x143/0x180 mm/kasan/report.c:602
>  lock_release+0x151/0xa30 kernel/locking/lockdep.c:5862
>  __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:165 [inline]
>  _raw_spin_unlock_bh+0x1b/0x40 kernel/locking/spinlock.c:210
>  spin_unlock_bh include/linux/spinlock.h:396 [inline]
>  ptr_ring_produce_bh include/linux/ptr_ring.h:164 [inline]
>  page_pool_recycle_in_ring net/core/page_pool.c:707 [inline]
>  page_pool_put_unrefed_netmem+0x748/0xb00 net/core/page_pool.c:826
>  page_pool_put_netmem include/net/page_pool/helpers.h:323 [inline]
>  page_pool_put_full_netmem include/net/page_pool/helpers.h:353 [inline]
>  napi_pp_put_page+0x149/0x2b0 net/core/skbuff.c:1036
>  skb_pp_recycle net/core/skbuff.c:1047 [inline]
>  skb_free_head net/core/skbuff.c:1094 [inline]
>  skb_release_data+0x6c4/0x8a0 net/core/skbuff.c:1125
>  skb_release_all net/core/skbuff.c:1190 [inline]
>  __kfree_skb net/core/skbuff.c:1204 [inline]
>  sk_skb_reason_drop+0x1c9/0x380 net/core/skbuff.c:1242
>  kfree_skb_reason include/linux/skbuff.h:1263 [inline]
>  __skb_queue_purge_reason include/linux/skbuff.h:3343 [inline]
> 
> [...]

Here is the summary with links:
  - [net,v2] page_pool: Fix use-after-free in page_pool_recycle_in_ring
    https://git.kernel.org/netdev/net/c/271683bb2cf3

You are awesome, thank you!
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