[PATCH] USB: Eagle and ADI 930 usb adsl modem driver fix

More care on loading firmware, take into account fw->size can't be zero.

Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/atm/ueagle-atm.c b/drivers/usb/atm/ueagle-atm.c
index 3e2475c..be08e16 100644 (file)
--- a/drivers/usb/atm/ueagle-atm.c
+++ b/drivers/usb/atm/ueagle-atm.c
@@ -426,14 +426,14 @@ static void uea_upload_pre_firmware(const struct firmware *fw_entry, void *conte
 
        pfw = fw_entry->data;
        size = fw_entry->size;
+       if (size < 4)
+               goto err_fw_corrupted;
 
        crc = FW_GET_LONG(pfw);
        pfw += 4;
        size -= 4;
-       if (crc32_be(0, pfw, size) != crc) {
-               uea_err(usb, "firmware is corrupted\n");
-               goto err;
-       }
+       if (crc32_be(0, pfw, size) != crc)
+               goto err_fw_corrupted;
 
        /*
         * Start to upload formware : send reset
@@ -446,9 +446,14 @@ static void uea_upload_pre_firmware(const struct firmware *fw_entry, void *conte
                goto err;
        }
 
-       while (size > 0) {
+       while (size > 3) {
                u8 len = FW_GET_BYTE(pfw);
                u16 add = FW_GET_WORD(pfw + 1);
+
+               size -= len + 3;
+               if (size < 0)
+                       goto err_fw_corrupted;
+
                ret = uea_send_modem_cmd(usb, add, len, pfw + 3);
                if (ret < 0) {
                        uea_err(usb, "uploading firmware data failed "
@@ -456,9 +461,11 @@ static void uea_upload_pre_firmware(const struct firmware *fw_entry, void *conte
                        goto err;
                }
                pfw += len + 3;
-               size -= len + 3;
        }
 
+       if (size != 0)
+               goto err_fw_corrupted;
+
        /*
         * Tell the modem we finish : de-assert reset
         */
@@ -469,6 +476,11 @@ static void uea_upload_pre_firmware(const struct firmware *fw_entry, void *conte
        else
                uea_info(usb, "firmware uploaded\n");
 
+       uea_leaves(usb);
+       return;
+
+err_fw_corrupted:
+       uea_err(usb, "firmware is corrupted\n");
 err:
        uea_leaves(usb);
 }
@@ -522,10 +534,6 @@ static int check_dsp(u8 *dsp, unsigned int len)
        u32 pageoffset;
        unsigned int i, j, p, pp;
 
-       /* enough space for pagecount? */
-       if (len < 1)
-               return 1;
-
        pagecount = FW_GET_BYTE(dsp);
        p = 1;