In the Linux kernel, the following vulnerability has been resolved: nfc: pn533: Add poll mod list filling check In case of improtocols value is 1 and tmprotocols value is 0 this combination successfully passes the check 'if (!improtocols && !tmprotocols)' in the nfcstartpoll(). But then after pn533pollcreatemodlist() call in pn533startpoll() poll mod list will remain empty and dev->pollmodcount will remain 0 which lead to division by zero. Normally no im protocol has value 1 in the mask, so this combination is not expected by driver. But these protocol values actually come from userspace via Netlink interface (NFCCMDSTARTPOLL operation). So a broken or malicious program may pass a message containing a "bad" combination of protocol parameter values so that dev->pollmodcount is not incremented inside pn533pollcreatemodlist(), thus leading to division by zero. Call trace looks like: nfcgenlstartpoll() nfcstartpoll() ->startpoll() pn533start_poll() Add poll mod list filling check. Found by Linux Verification Center (linuxtesting.org) with SVACE.
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