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[network] Avoid out ouf bounds read in __libc_res_nquerydomain

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2012-02-28  Jeff Law  <law@redhat.com>

	* resolv/res_query.c (__libc_res_nquerydomain): Avoid
	out of bounds read.
This commit is contained in:
Jeff Law
2012-02-29 11:51:27 -05:00
committed by Carlos O'Donell
parent 1f393a11f6
commit 8fdceb2efd
2 changed files with 12 additions and 3 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2012-02-29 Jeff Law <law@redhat.com>
* resolv/res_query.c (__libc_res_nquerydomain): Avoid
out of bounds read.
2012-02-29 Marek Polacek <polacek@redhat.com> 2012-02-29 Marek Polacek <polacek@redhat.com>
[BZ #13706] [BZ #13706]

10
resolv/res_query.c
View File

@ -556,12 +556,16 @@ __libc_res_nquerydomain(res_state statp,
* copy without '.' if present. * copy without '.' if present.
*/ */
n = strlen(name); n = strlen(name);
if (n >= MAXDNAME) {
/* Decrement N prior to checking it against MAXDNAME
so that we detect a wrap to SIZE_MAX and return
a reasonable error. */
n--;
if (n >= MAXDNAME - 1) {
RES_SET_H_ERRNO(statp, NO_RECOVERY); RES_SET_H_ERRNO(statp, NO_RECOVERY);
return (-1); return (-1);
} }
n--; if (name[n] == '.') {
if (n >= 0 && name[n] == '.') {
strncpy(nbuf, name, n); strncpy(nbuf, name, n);
nbuf[n] = '\0'; nbuf[n] = '\0';
} else } else