linux-kernel - #syz test

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Message-ID: <20260104182922.971326-1-contact@arnaud-lcm.com>
Date: Sun,  4 Jan 2026 18:29:22 +0000
From: Arnaud Lecomte <contact@...aud-lcm.com>
To: syzbot+d1b7fa1092def3628bd7@...kaller.appspotmail.com
Cc: contact@...aud-lcm.com,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: #syz test

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 2365541c81dd..b8ff4ccae2d6 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -465,7 +465,6 @@ static long __bpf_get_stack(struct pt_regs *regs, struct task_struct *task,

        if (trace_in) {
                trace = trace_in;
-               trace->nr = min_t(u32, trace->nr, max_depth);
        } else if (kernel && task) {
                trace = get_callchain_entry_for_task(task, max_depth);
        } else {
@@ -479,7 +478,8 @@ static long __bpf_get_stack(struct pt_regs *regs, struct task_struct *task,
                goto err_fault;
        }

-       trace_nr = trace->nr - skip;
+       trace_nr = min(trace->nr, max_depth);
+       trace_nr = trace_nr - skip;
        copy_len = trace_nr * elem_size;

        ips = trace->ip + skip;
--
2.43.0