4:20 a.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 625d3449788f85569096780592549d0340e9c0c7
commit: 75eaa498c99eebf9f9237656f69469e50197cc0b usb: gadget: Correct NULL pointer
checking in fsl gadget
config: arm64-randconfig-m031-20200622 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com>
New smatch warnings:
drivers/usb/gadget/udc/fsl_udc_core.c:1055 fsl_ep_fifo_status() error: we previously
assumed '_ep->desc' could be null (see line 1055)
#
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit...
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git remote update linus
git checkout 75eaa498c99eebf9f9237656f69469e50197cc0b
vim +1055 drivers/usb/gadget/udc/fsl_udc_core.c
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1047
static int fsl_ep_fifo_status(struct usb_ep *_ep)
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1048
{
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1049
struct fsl_ep *ep;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1050
struct fsl_udc *udc;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1051
int size = 0;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1052
u32 bitmask;
6414e94c203d92 drivers/usb/gadget/fsl_udc_core.c Li Yang 2011-11-23 1053
struct ep_queue_head *qh;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1054
75eaa498c99eeb drivers/usb/gadget/udc/fsl_udc_core.c Nikhil Badola 2019-10-21 @1055
if (!_ep || _ep->desc || !(_ep->desc->bEndpointAddress&0xF))
^^^^^^^^^
Reversed NULL test. This will always return -ENODEV. (Or possibly
crash. But I suspect it always returns -ENODEV instead of crashing).
The container_of() macro doesn't dereference anything, btw. It just
does pointer math. I think it would be cleaner to use ep_index() like
the original code did. In other words, perhaps it would look best
written like this:
ep = container_of(_ep, struct fsl_ep, ep);
if (!_ep || !_ep->desc || ep_index(ep) == 0)
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1056
return -ENODEV;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1057
75eaa498c99eeb drivers/usb/gadget/udc/fsl_udc_core.c Nikhil Badola 2019-10-21 1058
ep = container_of(_ep, struct fsl_ep, ep);
75eaa498c99eeb drivers/usb/gadget/udc/fsl_udc_core.c Nikhil Badola 2019-10-21 1059
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1060
udc = (struct fsl_udc *)ep->udc;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1061
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1062
if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1063
return -ESHUTDOWN;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1064
6414e94c203d92 drivers/usb/gadget/fsl_udc_core.c Li Yang 2011-11-23 1065
qh = get_qh_by_ep(ep);
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1066
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1067
bitmask = (ep_is_in(ep)) ? (1 << (ep_index(ep) + 16)) :
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1068
(1 << (ep_index(ep)));
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1069
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1070
if (fsl_readl(&dr_regs->endptstatus) & bitmask)
6414e94c203d92 drivers/usb/gadget/fsl_udc_core.c Li Yang 2011-11-23 1071
size = (qh->size_ioc_int_sts & DTD_PACKET_SIZE)
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1072
>> DTD_LENGTH_BIT_POS;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1073
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1074
pr_debug("%s %u\n", __func__, size);
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1075
return size;
2ea6698d7b9266 drivers/usb/gadget/fsl_udc_core.c Anatolij Gustschin 2011-04-18 1076
}
---
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