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watchdog: ziirave_wdt: Don't read out more than 'len' firmware bytes

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We only compare first 'len' bytes of read firmware, so we don't need
to read more that that.

Signed-off-by: Andrey Smirnov <[email protected]>
Cc: Chris Healy <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Rick Ramstetter <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
This commit is contained in:
Andrey Smirnov 2019-08-12 13:08:57 -07:00 • committed by Wim Van Sebroeck
commit de88053807
1 changed files with 4 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/watchdog/ziirave_wdt.c
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@ -318,6 +318,8 @@ static int ziirave_firm_verify(struct watchdog_device *wdd,
u16 addr;
for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
const u16 len = be16_to_cpu(rec->len);
addr = (be32_to_cpu(rec->addr) & 0xffff) >> 1;
if (addr < ZIIRAVE_FIRM_FLASH_MEMORY_START ||
addr > ZIIRAVE_FIRM_FLASH_MEMORY_END)
@ -331,7 +333,7 @@ static int ziirave_firm_verify(struct watchdog_device *wdd,
return ret;
}
for (i = 0; i < ARRAY_SIZE(data); i++) {
for (i = 0; i < len; i++) {
ret = i2c_smbus_read_byte_data(client,
ZIIRAVE_CMD_DOWNLOAD_READ_BYTE);
if (ret < 0) {
@ -342,7 +344,7 @@ static int ziirave_firm_verify(struct watchdog_device *wdd,
data[i] = ret;
}
if (memcmp(data, rec->data, be16_to_cpu(rec->len))) {
if (memcmp(data, rec->data, len)) {
dev_err(&client->dev,
"Firmware mismatch at address 0x%04x\n", addr);
return -EINVAL;