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Commit vendor fix for l2tp vulnerability reported by

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Przemyslaw Frasunek on bugtraq list.
This commit is contained in:
Bill Fenner 2004-01-13 17:28:06 +00:00
parent 9afd0c2902
commit b97c9af58a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor/tcpdump/dist/; revision=124486
1 changed files with 11 additions and 2 deletions
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13
contrib/tcpdump/print-l2tp.c
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@ -476,8 +476,17 @@ l2tp_avp_print(const u_char *dat, int length)
TCHECK(*ptr); /* Flags & Length */
len = EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_LEN_MASK;
/* If it is not long enough to decode the entire AVP, we'll
abandon. */
/* If it is not long enough to contain the header, we'll give up. */
if (len < 6)
goto trunc;
/* If it goes past the end of the remaining length of the packet,
we'll give up. */
if (len > (u_int)length)
goto trunc;
/* If it goes past the end of the remaining length of the captured
data, we'll give up. */
TCHECK2(*ptr, len);
/* After this point, no need to worry about truncation */