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firewire: cdev: require quadlet-aligned headers for transmit packets

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The definition of struct fw_cdev_iso_packet seems to imply that the
header_length must be quadlet-aligned, and in fact, specifying an
unaligned header has never really worked when using multiple packet
structures, because the position of the next control word is computed by
rounding the header_length _down_, so the last one to three bytes of the
header would overlap the next control word.

To avoid this problem, check that the header length is properly aligned.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Clemens Ladisch 2010-03-31 16:26:46 +02:00 committed by Stefan Richter
parent 4ba1d9c0c2
commit 385ab5bcd4
1 changed files with 2 additions and 0 deletions
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drivers/firewire/core-cdev.c
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@ -959,6 +959,8 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
u.packet.header_length = GET_HEADER_LENGTH(control);
if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
if (u.packet.header_length % 4 != 0)
return -EINVAL;
header_length = u.packet.header_length;
} else {
/*