linux-kernel - [PATCH] bpf: fix dump

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Message-Id: <20250708160737.1834080-1-arnd@kernel.org>
Date: Tue,  8 Jul 2025 18:07:29 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Kumar Kartikeya Dwivedi <memxor@...il.com>,
	Emil Tsalapatis <emil@...alapatis.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] bpf: fix dump_stack() type cast

From: Arnd Bergmann <arnd@...db.de>

Passing a pointer as a 'u64' variable requires a double cast when
converting it back to a pointer:

kernel/bpf/stream.c: In function 'dump_stack_cb':
kernel/bpf/stream.c:505:64: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
  505 |         ctxp->err = bpf_stream_stage_printk(ctxp->ss, "%pS\n", (void *)ip);
      |                                                                ^

Fixes: d7c431cafcb4 ("bpf: Add dump_stack() analogue to print to BPF stderr")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/bpf/stream.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/stream.c b/kernel/bpf/stream.c
index 8c842f845245..24433cdf6ede 100644
--- a/kernel/bpf/stream.c
+++ b/kernel/bpf/stream.c
@@ -498,11 +498,11 @@ static bool dump_stack_cb(void *cookie, u64 ip, u64 sp, u64 bp)
 		if (ret < 0)
 			goto end;
 		ctxp->err = bpf_stream_stage_printk(ctxp->ss, "%pS\n  %s @ %s:%d\n",
-						    (void *)ip, line, file, num);
+					    (void *)(uintptr_t)ip, line, file, num);
 		return !ctxp->err;
 	}
 end:
-	ctxp->err = bpf_stream_stage_printk(ctxp->ss, "%pS\n", (void *)ip);
+	ctxp->err = bpf_stream_stage_printk(ctxp->ss, "%pS\n", (void *)(uintptr_t)ip);
 	return !ctxp->err;
 }
 
-- 
2.39.5