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Fri, 17 Oct 2025 13:56:38 -0700 (PDT) Received: from fedora ([45.112.145.72]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b6a76b73727sm656973a12.40.2025.10.17.13.56.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Oct 2025 13:56:37 -0700 (PDT) From: neqbal To: syzbot+2617fc732430968b45d2@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, neqbal Subject: [PATCH] bpf: sync pending IRQ work before freeing ring buffer Date: Sat, 18 Oct 2025 02:25:46 +0530 Message-ID: <20251017205546.262475-1-nooraineqbal@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <68e7d0d8.050a0220.91a22.0008.GAE@google.com> References: <68e7d0d8.050a0220.91a22.0008.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" #syz test Fix a possible vmalloc out-of-bounds access caused by pending IRQ work Reported-by: syzbot+2617fc732430968b45d2@syzkaller.appspotmail.com Signed-off-by: neqbal Tested-by: syzbot+2617fc732430968b45d2@syzkaller.appspotmail.com --- kernel/bpf/ringbuf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/bpf/ringbuf.c b/kernel/bpf/ringbuf.c index 719d73299397..a6597417412f 100644 --- a/kernel/bpf/ringbuf.c +++ b/kernel/bpf/ringbuf.c @@ -216,6 +216,12 @@ static struct bpf_map *ringbuf_map_alloc(union bpf_att= r *attr) =20 static void bpf_ringbuf_free(struct bpf_ringbuf *rb) { + /* Ensure all pending IRQ work completes before freeing. + * In PREEMPT_RT, IRQ work runs in thread context and can + * race with ring buffer destruction. + */ + irq_work_sync(&rb->work); + /* copy pages pointer and nr_pages to local variable, as we are going * to unmap rb itself with vunmap() below */ --=20 2.51.0