linux-kernel - [PATCH v5 1/4] efi/cper: Adjust infopfx size to accept an extra space

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Message-ID: <665a5626bea1c13538fef09d2120343eeae04553.1719219886.git.mchehab+huawei@kernel.org>
Date: Mon, 24 Jun 2024 11:19:18 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: 
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	"Borislav Petkov" <bp@...en8.de>,
	"James Morse" <james.morse@....com>,
	"Jonathan Cameron" <Jonathan.Cameron@...wei.com>,
	"Shiju Jose" <shiju.jose@...wei.com>,
	"Tony Luck" <tony.luck@...el.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	linux-edac@...r.kernel.org,
	linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v5 1/4] efi/cper: Adjust infopfx size to accept an extra space

Compiling with W=1 with werror enabled produces an error:

drivers/firmware/efi/cper-arm.c: In function ‘cper_print_proc_arm’:
drivers/firmware/efi/cper-arm.c:298:64: error: ‘snprintf’ output may be truncated before the last format character [-Werror=format-truncation=]
  298 |                         snprintf(infopfx, sizeof(infopfx), "%s ", newpfx);
      |                                                                ^
drivers/firmware/efi/cper-arm.c:298:25: note: ‘snprintf’ output between 2 and 65 bytes into a destination of size 64
  298 |                         snprintf(infopfx, sizeof(infopfx), "%s ", newpfx);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

As the logic there adds an space at the end of infopx buffer.
Add an extra space to avoid such warning.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/firmware/efi/cper-arm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/cper-arm.c b/drivers/firmware/efi/cper-arm.c
index fa9c1c3bf168..eb7ee6af55f2 100644
--- a/drivers/firmware/efi/cper-arm.c
+++ b/drivers/firmware/efi/cper-arm.c
@@ -240,7 +240,7 @@ void cper_print_proc_arm(const char *pfx,
 	int i, len, max_ctx_type;
 	struct cper_arm_err_info *err_info;
 	struct cper_arm_ctx_info *ctx_info;
-	char newpfx[64], infopfx[64];
+	char newpfx[64], infopfx[ARRAY_SIZE(newpfx) + 1];
 
 	printk("%sMIDR: 0x%016llx\n", pfx, proc->midr);
 
-- 
2.45.2