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USB: usbmon: fix read(2)

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There's a bug in the usbmon binary reader: When using read() to fetch
the packets and a packet's data is partially read, the next read call
will once again return up to len_cap bytes of data. The b_read counter
is not regarded when determining the remaining chunk size.

So, when dumping USB data with "cat /dev/usbmon0 > usbmon.trace" while
reading from a USB storage device and analyzing the dump file
afterwards it will get out of sync after a couple of packets.

Signed-off-by: Ingo van Lil <[email protected]>
Signed-off-by: Pete Zaitcev <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Pete Zaitcev 2008-11-14 09:47:41 -07:00 • committed by Greg Kroah-Hartman
commit f1c0a2a3af
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/mon/mon_bin.c
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@ -687,7 +687,10 @@ static ssize_t mon_bin_read(struct file *file, char __user *buf,
}
if (rp->b_read >= sizeof(struct mon_bin_hdr)) {
step_len = min(nbytes, (size_t)ep->len_cap);
step_len = ep->len_cap;
step_len -= rp->b_read - sizeof(struct mon_bin_hdr);
if (step_len > nbytes)
step_len = nbytes;
offset = rp->b_out + PKT_SIZE;
offset += rp->b_read - sizeof(struct mon_bin_hdr);
if (offset >= rp->b_size)