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[37.27.107.159]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a156375198sm1112249e87.88.2026.03.12.12.11.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Mar 2026 12:11:44 -0700 (PDT) From: Josh Law X-Google-Original-From: Josh Law To: Masami Hiramatsu , Andrew Morton Cc: Josh Law , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v2 2/3] lib/bootconfig: check bounds before writing in __xbc_open_brace() Date: Thu, 12 Mar 2026 19:11:42 +0000 Message-Id: <20260312191143.28719-3-objecting@objecting.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260312191143.28719-1-objecting@objecting.org> References: <20260312191143.28719-1-objecting@objecting.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Josh Law The bounds check for brace_index happens after the array write. While the current call pattern prevents an actual out-of-bounds access (the previous call would have returned an error), the write-before-check pattern is fragile and would become a real out-of-bounds write if the error return were ever not propagated. Move the bounds check before the array write so the function is self-contained and safe regardless of caller behavior. Signed-off-by: Josh Law --- lib/bootconfig.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/bootconfig.c b/lib/bootconfig.c index a1e6a2e14b01..62b4ed7a0ba6 100644 --- a/lib/bootconfig.c +++ b/lib/bootconfig.c @@ -532,9 +532,9 @@ static char *skip_spaces_until_newline(char *p) static int __init __xbc_open_brace(char *p) { /* Push the last key as open brace */ - open_brace[brace_index++] = xbc_node_index(last_parent); if (brace_index >= XBC_DEPTH_MAX) return xbc_parse_error("Exceed max depth of braces", p); + open_brace[brace_index++] = xbc_node_index(last_parent); return 0; } -- 2.34.1