wifi: brcmfmac: validate bsscfg indices in IF events

jira VULN-185621
cve CVE-2026-43110
commit-author Pengpeng Hou <pengpeng@iscas.ac.cn>
commit 304950a

brcmf_fweh_handle_if_event() validates the firmware-provided interface
index before it touches drvr->iflist[], but it still uses the raw
bsscfgidx field as an array index without a matching range check.

Reject IF events whose bsscfg index does not fit in drvr->iflist[]
before indexing the interface array.

	Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
	Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Link: https://patch.msgid.link/20260323074551.93530-1-pengpeng@iscas.ac.cn
[add missing wifi prefix]
	Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit 304950a)
	Signed-off-by: CIQ Kernel Automation <ciq_kernel_automation@ciq.com>

Author: CIQ Kernel Automation

drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c

@@ -151,6 +151,11 @@ static void brcmf_fweh_handle_if_event(struct brcmf_pub *drvr,
 		bphy_err(drvr, "invalid interface index: %u\n", ifevent->ifidx);
 		return;
 	}
+	if (ifevent->bsscfgidx >= BRCMF_MAX_IFS) {
+		bphy_err(drvr, "invalid bsscfg index: %u\n",
+			 ifevent->bsscfgidx);
+		return;
+	}
 
 	ifp = drvr->iflist[ifevent->bsscfgidx];