diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/bcm47xxpart.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c index fe2581d9d882..1f0239848ebe 100644 --- a/drivers/mtd/bcm47xxpart.c +++ b/drivers/mtd/bcm47xxpart.c @@ -186,6 +186,8 @@ static int bcm47xxpart_parse(struct mtd_info *master, /* TRX */ if (buf[0x000 / 4] == TRX_MAGIC) { struct trx_header *trx; + uint32_t last_subpart; + uint32_t trx_size; if (trx_num >= ARRAY_SIZE(trx_parts)) pr_warn("No enough space to store another TRX found at 0x%X\n", @@ -195,11 +197,23 @@ static int bcm47xxpart_parse(struct mtd_info *master, bcm47xxpart_add_part(&parts[curr_part++], "firmware", offset, 0); - /* Jump to the end of TRX */ + /* + * Try to find TRX size. The "length" field isn't fully + * reliable as it could be decreased to make CRC32 cover + * only part of TRX data. It's commonly used as checksum + * can't cover e.g. ever-changing rootfs partition. + * Use offsets as helpers for assuming min TRX size. + */ trx = (struct trx_header *)buf; - offset = roundup(offset + trx->length, blocksize); - /* Next loop iteration will increase the offset */ - offset -= blocksize; + last_subpart = max3(trx->offset[0], trx->offset[1], + trx->offset[2]); + trx_size = max(trx->length, last_subpart + blocksize); + + /* + * Skip the TRX data. Decrease offset by block size as + * the next loop iteration will increase it. + */ + offset += roundup(trx_size, blocksize) - blocksize; continue; } |