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| author | Ashwini Sharma <ak.ashwini1981@gmail.com> | 2014-05-21 05:12:38 -0500 |
|---|---|---|
| committer | Ashwini Sharma <ak.ashwini1981@gmail.com> | 2014-05-21 05:12:38 -0500 |
| commit | 95d2ce84789011970e2f814b2fb6c819084bde8c (patch) | |
| tree | 476a885945d14f5e0b59dbb7dc4974f93547a54d | |
| parent | b06b0fe32361f7fc5b3fb98bf5f2c2791be757e8 (diff) | |
| download | toybox-95d2ce84789011970e2f814b2fb6c819084bde8c.tar.gz | |
dhcp client had a segfault, when DHCP message contained 'pad' option.
The parsing logic kept checking for other options beyond __pad__ option, without
checking if it was __end__ option after that or not.
| -rw-r--r-- | toys/pending/dhcp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/toys/pending/dhcp.c b/toys/pending/dhcp.c index f93c9406..2b432cb3 100644 --- a/toys/pending/dhcp.c +++ b/toys/pending/dhcp.c @@ -1101,7 +1101,10 @@ static uint8_t dhcpc_parseoptions(dhcpc_result_t *presult, uint8_t *optptr) } while (*optptr != DHCP_OPTION_END) { - while (*optptr == DHCP_OPTION_PADDING) optptr++; + if (*optptr == DHCP_OPTION_PADDING) { + optptr++; + continue; + } if (*optptr == DHCP_OPTION_OVERLOAD) { overloaded = optptr[2]; optptr += optptr[1] + 2; |