Messages in this thread Patch in this message | | | Subject | [PATCH 1/5] pktcdvd: Fix overflow for discs with large packets | From | Peter Osterlund <> | Date | 03 Feb 2006 21:16:27 +0100 |
| |
From: Phillip Susi <psusi@cfl.rr.com>
The pktcdvd driver was using an 8 bit field to store the packet length obtained from the disc track info. This causes it to overflow packet length values of 128KB or more. I changed the field to 32 bits to fix this.
The pktcdvd driver defaulted to its maximum allowed packet length when it detected a 0 in the track info field. I changed this to fail the operation and refuse to access the media. This seems more sane than attempting to access it with a value that almost certainly will not work.
Signed-off-by: Peter Osterlund <petero2@telia.com> ---
drivers/block/pktcdvd.c | 2 +- include/linux/pktcdvd.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index 81ad466..f0a0ad4 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -1640,7 +1640,7 @@ static int pkt_probe_settings(struct pkt pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; if (pd->settings.size == 0) { printk("pktcdvd: detected zero packet size!\n"); - pd->settings.size = 128; + return -ENXIO; } if (pd->settings.size > PACKET_MAX_SECTORS) { printk("pktcdvd: packet size is too big\n"); diff --git a/include/linux/pktcdvd.h b/include/linux/pktcdvd.h index 2c177e4..d1c9c4a 100644 --- a/include/linux/pktcdvd.h +++ b/include/linux/pktcdvd.h @@ -114,7 +114,7 @@ struct pkt_ctrl_command { struct packet_settings { - __u8 size; /* packet size in (512 byte) sectors */ + __u32 size; /* packet size in (512 byte) sectors */ __u8 fp; /* fixed packets */ __u8 link_loss; /* the rest is specified * as per Mt Fuji */ -- Peter Osterlund - petero2@telia.com http://web.telia.com/~u89404340 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |