media: smsusb: better handle optional alignment
BugLink: https://bugs.launchpad.net/bugs/1832661 commit a4768663 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: 31e0456d ("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> Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com> Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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