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| author | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-05-24 17:59:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-09 10:18:15 +0300 |
| commit | b22f4cea240c9b69fd52cfe961dfaf91fbe5fea0 (patch) | |
| tree | 103da771da634a0b521608e71dbba9c135ee8878 /drivers/media/usb/siano/smsusb.c | |
| parent | 629b11aac24da3b0017e86d76c51789b52c05af3 (diff) | |
| download | linux-b22f4cea240c9b69fd52cfe961dfaf91fbe5fea0.tar.xz | |
media: smsusb: better handle optional alignment
commit a47686636d84eaec5c9c6e84bd5f96bed34d526d upstream.
Most Siano devices require an alignment for the response.
Changeset f3be52b0056a ("media: usb: siano: Fix general protection fault in smsusb")
changed the logic with gets such aligment, but it now produces a
sparce warning:
drivers/media/usb/siano/smsusb.c: In function 'smsusb_init_device':
drivers/media/usb/siano/smsusb.c:447:37: warning: 'in_maxp' may be used uninitialized in this function [-Wmaybe-uninitialized]
447 | dev->response_alignment = in_maxp - sizeof(struct sms_msg_hdr);
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
The sparse message itself is bogus, but a broken (or fake) USB
eeprom could produce a negative value for response_alignment.
So, change the code in order to check if the result is not
negative.
Fixes: 31e0456de5be ("media: usb: siano: Fix general protection fault in smsusb")
CC: <stable@vger.kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/media/usb/siano/smsusb.c')
| -rw-r--r-- | drivers/media/usb/siano/smsusb.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/media/usb/siano/smsusb.c b/drivers/media/usb/siano/smsusb.c index a2c3bb9c0d99..ec759f43c634 100644 --- a/drivers/media/usb/siano/smsusb.c +++ b/drivers/media/usb/siano/smsusb.c @@ -402,7 +402,7 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id) struct smsusb_device_t *dev; void *mdev; int i, rc; - int in_maxp = 0; + int align = 0; /* create device object */ dev = kzalloc(sizeof(struct smsusb_device_t), GFP_KERNEL); @@ -420,14 +420,14 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id) if (desc->bEndpointAddress & USB_DIR_IN) { dev->in_ep = desc->bEndpointAddress; - in_maxp = usb_endpoint_maxp(desc); + align = usb_endpoint_maxp(desc) - sizeof(struct sms_msg_hdr); } else { dev->out_ep = desc->bEndpointAddress; } } pr_debug("in_ep = %02x, out_ep = %02x\n", dev->in_ep, dev->out_ep); - if (!dev->in_ep || !dev->out_ep) { /* Missing endpoints? */ + if (!dev->in_ep || !dev->out_ep || align < 0) { /* Missing endpoints? */ smsusb_term_device(intf); return -ENODEV; } @@ -446,7 +446,7 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id) /* fall-thru */ default: dev->buffer_size = USB2_BUFFER_SIZE; - dev->response_alignment = in_maxp - sizeof(struct sms_msg_hdr); + dev->response_alignment = align; params.flags |= SMS_DEVICE_FAMILY2; break; |