From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 136BF35945; Mon, 6 Jan 2025 16:01:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736179295; cv=none; b=Nk0UBa2Q3xV4+FYGN/Gv7hRw2TXUpSaKlm8/5JDzWXLwH6OwHK3XrcixRMh4tf87AeXl9AYgMmOXqQzi6L/8z9nzEZdlP88pUZYbFUz/FTPnb+kZyRriDAlWDFyf9QMIVZunzrtvHlNkfDCanSlzmcfvCSXjGNdIFrvYrrKIYOU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736179295; c=relaxed/simple; bh=pVy55OOvRTXnO+o3bLwTfVpPAfpI4uvVVln8Dc+g5sw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lpeKNoN/oJHcK7LP5utCGa5qOf/QFfCrRuONs2J7EY2QTsL0Qf7TrLfN9bJQM3dL1STCMCgAq3sC5BZqw1psBmbwQCoBbcXP3sOkQ0eSmp9DEAAtbfzjdLmhemnhIJ0/2BBk806LxbP2SK/tDry0M9LY2xrPQE9WZREvZQSswn4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Lj9m5PZ/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Lj9m5PZ/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77A7CC4CED2; Mon, 6 Jan 2025 16:01:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1736179294; bh=pVy55OOvRTXnO+o3bLwTfVpPAfpI4uvVVln8Dc+g5sw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lj9m5PZ/3viEYhgonHYuhHVDauSDbixb5VCAzjI08TUlQD8gEd9p1szJg43xLGXZq 9UGihw7mGYFIMUG4W38fib7BsCKeYScgRZOWrKTQXWoiVTtgwuqm1/0RJ9FnQYCm/p 72M73bz15hcMMZoFaaGDHJoHG4c+vICBdN+mExJc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Anton Protopopov , Jiri Olsa , Andrii Nakryiko , Alexei Starovoitov , Sasha Levin Subject: [PATCH 5.4 82/93] bpf: fix potential error return Date: Mon, 6 Jan 2025 16:17:58 +0100 Message-ID: <20250106151131.800565031@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250106151128.686130933@linuxfoundation.org> References: <20250106151128.686130933@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Anton Protopopov [ Upstream commit c4441ca86afe4814039ee1b32c39d833c1a16bbc ] The bpf_remove_insns() function returns WARN_ON_ONCE(error), where error is a result of bpf_adj_branches(), and thus should be always 0 However, if for any reason it is not 0, then it will be converted to boolean by WARN_ON_ONCE and returned to user space as 1, not an actual error value. Fix this by returning the original err after the WARN check. Signed-off-by: Anton Protopopov Acked-by: Jiri Olsa Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/r/20241210114245.836164-1-aspsk@isovalent.com Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin --- kernel/bpf/core.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index dde21d23f220..9fb103426cf0 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -496,6 +496,8 @@ struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off, int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt) { + int err; + /* Branch offsets can't overflow when program is shrinking, no need * to call bpf_adj_branches(..., true) here */ @@ -503,7 +505,9 @@ int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt) sizeof(struct bpf_insn) * (prog->len - off - cnt)); prog->len -= cnt; - return WARN_ON_ONCE(bpf_adj_branches(prog, off, off + cnt, off, false)); + err = bpf_adj_branches(prog, off, off + cnt, off, false); + WARN_ON_ONCE(err); + return err; } static void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp) -- 2.39.5