Red Hat Bugzilla – Bug 1016064
libndp: NDP option decoder issues
Last modified: 2015-05-04 21:24:36 EDT
In ndp_msg_check_opts() in libndp/libndp.c, this code is used to parse the option header:
uint8_t cur_opt_raw_type = ptr;
uint8_t cur_opt_len = ptr << 3; /* convert to bytes */
The type of cur_opt_len is incorrect, it should be unsigned, so that large values are not clipped. With the current code, libndp parsing gets out of sync with the payload and subsequent options are not recognized.
In addition, RFC 2461 requires that packets with zero-length options are silently discarded. The code merely stops options processing at the first zero-length option.
ndp_msg_next_opt_offset() has the same problem.
This request was resolved in Red Hat Enterprise Linux 7.0.
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