The kernel allows a NULL msg in recvfrom so that he size of the next
message may be queried before allocating a correctly sized buffer. This
change allows the syscall translator to pass along the NULL msg pointer
instead of returning early with EFAULT.
Signed-off-by: Zach Reizner <zachr@google.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <CAFNex=DvFCq=AQf+=19fTfw-T8eZZT=3NnFFm2JMFvVr5QgQyA@mail.gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
void *host_msg;
abi_long ret;
- host_msg = lock_user(VERIFY_WRITE, msg, len, 0);
- if (!host_msg)
- return -TARGET_EFAULT;
+ if (!msg) {
+ host_msg = NULL;
+ } else {
+ host_msg = lock_user(VERIFY_WRITE, msg, len, 0);
+ if (!host_msg) {
+ return -TARGET_EFAULT;
+ }
+ }
if (target_addr) {
if (get_user_u32(addrlen, target_addrlen)) {
ret = -TARGET_EFAULT;