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isis: add some additional length checks.

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Make sure the length in question is big enough before fetching data and
subtracting from it.
This commit is contained in:
Guy Harris 2020-05-26 22:14:24 -07:00
parent 3cb1082cb5
commit a225ce337d
1 changed files with 4 additions and 0 deletions
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4
print-isoclns.c
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@ -1921,10 +1921,14 @@ isis_print_ip_reach_subtlv(netdissect_options *ndo,
algo = GET_U_1(tptr+1);
if (flags & ISIS_PREFIX_SID_FLAG_V) {
if (subl < 5)
goto trunc;
sid = GET_BE_U_3(tptr+2);
tptr+=5;
subl-=5;
} else {
if (subl < 6)
goto trunc;
sid = GET_BE_U_4(tptr+2);
tptr+=6;
subl-=6;