linux-kernel - [PATCH 5.18 1089/1095] bpf: Suppress passing zero to PTR

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Message-Id: <20220815180514.073914895@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:08:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH 5.18 1089/1095] bpf: Suppress passing zero to PTR_ERR warning

From: Kumar Kartikeya Dwivedi <memxor@...il.com>

commit 1ec5ee8c8a5a65ea377f8bea64bf4d5b743f6f79 upstream.

Kernel Test Robot complains about passing zero to PTR_ERR for the said
line, suppress it by using PTR_ERR_OR_ZERO.

Fixes: c0a5a21c25f3 ("bpf: Allow storing referenced kptr in map")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Link: https://lore.kernel.org/bpf/20220521132620.1976921-1-memxor@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/bpf/verifier.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5327,7 +5327,7 @@ static int process_kptr_func(struct bpf_
 		return -EINVAL;
 	}
 	if (!map_value_has_kptrs(map_ptr)) {
-		ret = PTR_ERR(map_ptr->kptr_off_tab);
+		ret = PTR_ERR_OR_ZERO(map_ptr->kptr_off_tab);
 		if (ret == -E2BIG)
 			verbose(env, "map '%s' has more than %d kptr\n", map_ptr->name,
 				BPF_MAP_VALUE_OFF_MAX);