tree c04709e42675946d6a2ff1dee2fe88a63b3cef3a
parent 4a142251a315e4df6f12a7c99a2a6dfe4ac273ec
author Mateusz Jurczyk <mjurczyk@google.com> 1497372268 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1501193276 -0700

NFC: Add sockaddr length checks before accessing sa_family in bind handlers

commit f6a5885fc4d68e7f25ffb42b9d8d80aebb3bacbb upstream.

Verify that the caller-provided sockaddr structure is large enough to
contain the sa_family field, before accessing it in bind() handlers of the
AF_NFC socket. Since the syscall doesn't enforce a minimum size of the
corresponding memory region, very short sockaddrs (zero or one byte long)
result in operating on uninitialized memory while referencing .sa_family.

Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>