[PATCH] linux-user: allow NULL msg in recvfrom

[Zach Reizner]

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>
---
 linux-user/syscall.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 1e508576c7..332544b43c 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -3680,8 +3680,6 @@ static abi_long do_recvfrom(int fd, abi_ulong
msg, size_t len, int flags,
     abi_long ret;

     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;
-- 
2.31.0.291.g576ba9dcdaf-goog