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| author | Sergei Shtylyov <sshtylyov@ru.mvista.com> | 2009-02-21 15:31:23 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-27 14:40:51 -0800 |
| commit | 3ecdb9acf343bbcf2bb2c287dc524ab709cfad7e (patch) | |
| tree | 0e6bb1dada7b9793c7f95cff9498a3283fade244 /drivers/usb/musb | |
| parent | 51d9f3e100a8f8cc2be89d5f13d37de61e2da38a (diff) | |
| download | blackbird-op-linux-3ecdb9acf343bbcf2bb2c287dc524ab709cfad7e.tar.gz blackbird-op-linux-3ecdb9acf343bbcf2bb2c287dc524ab709cfad7e.zip | |
USB: musb: be careful with 64K+ transfer lengths, host side
Feeding 32-bit length cast down to 'u16' to min() to calculate the FIFO
count in musb_host_tx() risks sending a short packet prematurely for
transfer sizes over 64 KB.
Similarly, although data transfer size shouldn't exceed 65535 bytes for
the control endpoint, making musb_h_ep0_continue() more robust WRT URBs
with possibly oversized buffer will not hurt either...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/musb')
| -rw-r--r-- | drivers/usb/musb/musb_host.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index fc79e76b3845..23d3890fd54d 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -937,8 +937,8 @@ static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) switch (musb->ep0_stage) { case MUSB_EP0_IN: fifo_dest = urb->transfer_buffer + urb->actual_length; - fifo_count = min(len, ((u16) (urb->transfer_buffer_length - - urb->actual_length))); + fifo_count = min_t(size_t, len, urb->transfer_buffer_length - + urb->actual_length); if (fifo_count < len) urb->status = -EOVERFLOW; @@ -971,10 +971,9 @@ static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) } /* FALLTHROUGH */ case MUSB_EP0_OUT: - fifo_count = min(qh->maxpacket, ((u16) - (urb->transfer_buffer_length - - urb->actual_length))); - + fifo_count = min_t(size_t, qh->maxpacket, + urb->transfer_buffer_length - + urb->actual_length); if (fifo_count) { fifo_dest = (u8 *) (urb->transfer_buffer + urb->actual_length); @@ -1304,7 +1303,8 @@ void musb_host_tx(struct musb *musb, u8 epnum) * packets before updating TXCSR ... other docs disagree ... */ /* PIO: start next packet in this URB */ - wLength = min(qh->maxpacket, (u16) wLength); + if (wLength > qh->maxpacket) + wLength = qh->maxpacket; musb_write_fifo(hw_ep, wLength, buf); qh->segsize = wLength; |
