Merge: firmware: cs_dsp: Return error if block header overflows file

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/4989

JIRA: https://issues.redhat.com/browse/RHEL-53650  
CVE: CVE-2024-42238  
  
Signed-off-by: David Arcari <darcari@redhat.com>

Approved-by: Steve Best <sbest@redhat.com>
Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Lucas Zampieri <lzampier@redhat.com>

Author: zampierilucas

drivers/firmware/cirrus/cs_dsp.c

@@ -1526,8 +1526,13 @@ static int cs_dsp_load(struct cs_dsp *dsp, const struct firmware *firmware,
 	cs_dsp_dbg(dsp, "%s: timestamp %llu\n", file,
 		   le64_to_cpu(footer->timestamp));
 
-	while (pos < firmware->size &&
-	       sizeof(*region) < firmware->size - pos) {
+	while (pos < firmware->size) {
+		/* Is there enough data for a complete block header? */
+		if (sizeof(*region) > firmware->size - pos) {
+			ret = -EOVERFLOW;
+			goto out_fw;
+		}
+
 		region = (void *)&(firmware->data[pos]);
 		region_name = "Unknown";
 		reg = 0;
@@ -2215,8 +2220,13 @@ static int cs_dsp_load_coeff(struct cs_dsp *dsp, const struct firmware *firmware
 	pos = le32_to_cpu(hdr->len);
 
 	blocks = 0;
-	while (pos < firmware->size &&
-	       sizeof(*blk) < firmware->size - pos) {
+	while (pos < firmware->size) {
+		/* Is there enough data for a complete block header? */
+		if (sizeof(*blk) > firmware->size - pos) {
+			ret = -EOVERFLOW;
+			goto out_fw;
+		}
+
 		blk = (void *)(&firmware->data[pos]);
 
 		type = le16_to_cpu(blk->type);