[PATCH 11/28] wifi: brcmfmac: Replace strlcat() with snprintf() in brcmf_fw_alloc_request()

brcmf_fw_alloc_request() constructs firmware file paths by chaining
strscpy() and multiple strlcat() calls for the module parameter path,
separator, base name, and extension.

In preparation for removing the deprecated strlcat() API[1], format the
complete firmware path in a single snprintf() call.

Link: https://github.com/KSPP/linux/issues/370 [1]
Cc: codemender-patching+linux@google.com
Assisted-by: SecurityEngineer:GPT-4o [editor_update_file, make_kernel_build_single_file, shell_command_run]
Signed-off-by: Bill Wendling <morbo@google.com>
---
Cc: Russell King <linux@armlinux.org.uk>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
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Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
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Cc: Matthias Schwarzott <zzam@gentoo.org>
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Cc: Tony Nguyen <anthony.l.nguyen@intel.com>
Cc: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Cc: Andrew Lunn <andrew+netdev@lunn.ch>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
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Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Peter Griffin <peter.griffin@linaro.org>
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Cc: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
Cc: Sudarsana Kalluru <sudarsana.kalluru@qlogic.com>
Cc: "Martin K. Petersen" <mkp@kernel.org>
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Cc: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
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---
 .../broadcom/brcm80211/brcmfmac/firmware.c    | 21 +++++++------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
index 22ff326f1924..2f74a952599e 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c

@@ -845,22 +845,17 @@ brcmf_fw_alloc_request(u32 chip, u32 chiprev,
 	fwreq->n_items = n_fwnames;
 
 	for (j = 0; j < n_fwnames; j++) {
-		fwreq->items[j].path = fwnames[j].path;
-		fwnames[j].path[0] = '\0';
 		/* check if firmware path is provided by module parameter */
 		if (brcmf_mp_global.firmware_path[0] != '\0') {
-			strscpy(fwnames[j].path, mp_path,
-				BRCMF_FW_NAME_LEN);
-
-			if (end != '/') {
-				strlcat(fwnames[j].path, "/",
-					BRCMF_FW_NAME_LEN);
-			}
+			snprintf(fwnames[j].path, BRCMF_FW_NAME_LEN, "%s%s%s%s",
+				 mp_path, (end == '/') ? "" : "/",
+				 mapping_table[i].fw_base,
+				 fwnames[j].extension);
+		} else {
+			snprintf(fwnames[j].path, BRCMF_FW_NAME_LEN, "%s%s",
+				 mapping_table[i].fw_base,
+				 fwnames[j].extension);
 		}
-		strlcat(fwnames[j].path, mapping_table[i].fw_base,
-			BRCMF_FW_NAME_LEN);
-		strlcat(fwnames[j].path, fwnames[j].extension,
-			BRCMF_FW_NAME_LEN);
 		fwreq->items[j].path = fwnames[j].path;
 	}
 

-- 
2.55.0.1032.g73a4cd73de-goog