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Fix assertion failure related to openbsd strtol().

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Fixes bug 22789; bugfix on 0.2.3.8-alpha.
This commit is contained in:
Nick Mathewson 2017-07-03 11:20:09 -04:00
parent d56f699399
commit bb3f74e66b
3 changed files with 21 additions and 2 deletions
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6
changes/bug22789 Normal file
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@ -0,0 +1,6 @@
o Major bugfixes (openbsd, denial-of-service):
- Avoid an assertion failure bug affecting our implementation of
inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
handling of "0xfoo" differs from what we had expected.
Fixes bug 22789; bugfix on 0.2.3.8-alpha.

8
src/common/compat.c
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@ -2045,8 +2045,12 @@ tor_inet_pton(int af, const char *src, void *dst)
char *next;
ssize_t len;
long r = strtol(src, &next, 16);
tor_assert(next != NULL);
tor_assert(next != src);
if (next == NULL || next == src) {
/* The 'next == src' error case can happen on versions of openbsd
* where treats "0xfoo" as an error, rather than as "0" followed by
* "xfoo". */
return 0;
}
len = *next == '\0' ? eow - src : next - src;
if (len > 4)

9
src/test/test_addr.c
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@ -340,6 +340,15 @@ test_addr_ip6_helpers(void)
test_pton6_bad("a:::b:c");
test_pton6_bad(":::a:b:c");
test_pton6_bad("a:b:c:::");
/* Regression tests for 22789. */
test_pton6_bad("0xfoo");
test_pton6_bad("0x88");
test_pton6_bad("0xyxxy");
test_pton6_bad("0XFOO");
test_pton6_bad("0X88");
test_pton6_bad("0XYXXY");
test_pton6_bad("0x");
test_pton6_bad("0X");
/* test internal checking */
test_external_ip("fbff:ffff::2:7", 0);