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Group AFNUM needs to be extracted before moving bp pointer #1025

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Group AFNUM needs to be extracted before moving bp pointer #1025

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4 changes: 3 additions & 1 deletion print-pgm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -329,6 +329,7 @@ pgm_print(netdissect_options *ndo,
case PGM_NCF: {
const struct pgm_nak *nak;
char source_buf[INET6_ADDRSTRLEN], group_buf[INET6_ADDRSTRLEN];
unsigned afnum;

nak = (const struct pgm_nak *)(pgm + 1);
ND_TCHECK_SIZE(nak);
Expand Down Expand Up @@ -358,8 +359,9 @@ pgm_print(netdissect_options *ndo,
* Skip past the group, saving info along the way
* and stopping if we don't have enough.
*/
afnum = GET_BE_U_2(bp);
bp += (2 * sizeof(uint16_t));
switch (GET_BE_U_2(bp)) {
switch (afnum) {
case AFNUM_INET:
ND_TCHECK_LEN(bp, sizeof(nd_ipv4));
addrtostr(bp, group_buf, sizeof(group_buf));
Expand Down