[Bug 6998] New: ping6 segmentation fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6998

           Summary: ping6 segmentation fault
           Product: Busybox
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Networking
        AssignedTo: unassigned at busybox.net
        ReportedBy: dajiangwan at gmail.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


when running ping6 on an ARM( Atmel AT91SAM9260, linux-2.6.38.8).
the command is:
ping6 -c 4 ::1
PING ::1 (::1): 56 data bytes
Segmentation fault


#816 line: (busybox-1.22.1/networking/ping.c)
    for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
    if (mp->cmsg_level == SOL_IPV6
        && mp->cmsg_type == IPV6_HOPLIMIT
        /* don't check len - we trust the kernel: */
        /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
        ) {
            /*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
            move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
            break;
        }
    }
    }

I add "break" at line 824, then I test again, all is OK!

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