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| author | Khalid Masum <khalid.masum.92@gmail.com> | 2022-08-24 22:38:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-31 10:07:53 +0300 |
| commit | d27c66adb4c0b16c817f71ba96e90f322e7419af (patch) | |
| tree | da43a6faca6ba7cb368fce24a7d88c714fa93708 /drivers/usb/host | |
| parent | 4348f2e3ab3358898bfe93387ced7f3e1e3a6186 (diff) | |
| download | linux-d27c66adb4c0b16c817f71ba96e90f322e7419af.tar.xz | |
usb: ehci: Use endpoint in URB to get maxpacket
usb_maxpacket() looks up the endpoint number in the pipe which can fail
if the interface or configuration changes before the routine is called.
This is unexpected and may even cause a modulo by zero afterwards.
So use usb_endpoint_maxp() routine which uses the endpoint stored in URB
to get the maxpacket.
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Khalid Masum <khalid.masum.92@gmail.com>
Addresses-Coverity: 744857 ("Division or modulo by zero")
Addresses-Coverity: 1487371 ("Division or modulo by zero")
Link: https://lore.kernel.org/r/20220824193813.13129-1-khalid.masum.92@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/ehci-q.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index 807e64991e3e..666f5c4db25a 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -645,7 +645,7 @@ qh_urb_transaction ( token |= (1 /* "in" */ << 8); /* else it's already initted to "out" pid (0 << 8) */ - maxpacket = usb_maxpacket(urb->dev, urb->pipe); + maxpacket = usb_endpoint_maxp(&urb->ep->desc); /* * buffer gets wrapped in one or more qtds; @@ -1218,7 +1218,7 @@ static int ehci_submit_single_step_set_feature( token |= (1 /* "in" */ << 8); /*This is IN stage*/ - maxpacket = usb_maxpacket(urb->dev, urb->pipe); + maxpacket = usb_endpoint_maxp(&urb->ep->desc); qtd_fill(ehci, qtd, buf, len, token, maxpacket); |