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am b145b5ef: Merge "Fix broken pointer overflow check ns_name_unpack()"

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* commit 'b145b5ef7c91ec76e4dc8450f70b7af80873b46e':
  Fix broken pointer overflow check ns_name_unpack()
This commit is contained in:
Calin Juravle 2014-03-11 18:42:23 +00:00 committed by Android Git Automerger
commit d7a269ccee
1 changed files with 5 additions and 2 deletions
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7
libc/dns/nameser/ns_name.c
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@ -473,11 +473,14 @@ ns_name_unpack2(const u_char *msg, const u_char *eom, const u_char *src,
_DIAGASSERT(__type_fit(int, srcp - src + 1));
len = (int)(srcp - src + 1);
}
srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
if (srcp < msg || srcp >= eom) { /* Out of range. */
// BEGIN android-changed: safer pointer overflow check
l = (((n & 0x3f) << 8) | (*srcp & 0xff));
if (l >= eom - msg) { /* Out of range. */
errno = EMSGSIZE;
return (-1);
}
srcp = msg + l;
// END android-changed
checked += 2;
/*
* Check for loops in the compressed name;