[PATCH v2] mfd: iqs62x: reject zero-length firmware records

struct iqs62x_fw_rec includes the first data byte in its fixed-size header,
so the parser advances by len - 1 bytes after that header. A zero len makes
the size_t cursor update move back by one byte, so the next record overlaps
the current record instead of following a valid declared extent.

Reject zero-length records and express the remaining-size check without an
offset addition.

Fixes: 4d9cf7df8d35 ("mfd: Add support for Azoteq IQS620A/621/622/624/625")
Signed-off-by: Pengpeng Hou <[email protected]>
---
Changes since v1: https://lore.kernel.org/all/[email protected]/
- use the author's full name in the mail metadata
- rebase onto v7.2-rc4

 drivers/mfd/iqs62x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/iqs62x.c b/drivers/mfd/iqs62x.c
index ee017617d1d1..412ae7777f72 100644
--- a/drivers/mfd/iqs62x.c
+++ b/drivers/mfd/iqs62x.c
@@ -237,7 +237,7 @@ static int iqs62x_firmware_parse(struct iqs62x_core *iqs62x,
 		fw_rec = (struct iqs62x_fw_rec *)(fw->data + pos);
 		pos += sizeof(*fw_rec);
 
-		if (pos + fw_rec->len - 1 > fw->size) {
+		if (!fw_rec->len || fw_rec->len - 1 > fw->size - pos) {
 			ret = -EINVAL;
 			break;
 		}