inet_pton: fix uninitialized memory use for IPv4-mapped IPv6 addresses

When a dot is encountered, the loop counter is incremented before
exiting the loop, but the corresponding ip array element is left
uninitialized, so the subsequent memmove (if "::" was seen) and the
loop copying ip to the output buffer will operate on an uninitialized
uint16_t.

The uninitialized data never directly influences the control flow and
is overwritten on successful return by the second half of the parsed
IPv4 address. But it's better to fix this to avoid unexpected
transformations by a sufficiently smart compiler and reports from
UB-detection tools.
This commit is contained in:
Alexey Izbyshev 2023-01-26 14:47:39 +03:00 committed by Rich Felker
parent 7e6da7ac98
commit 7e13e5ae69

View File

@ -54,6 +54,7 @@ int inet_pton(int af, const char *restrict s, void *restrict a0)
if (s[j]!='.' || (i<6 && brk<0)) return 0;
need_v4=1;
i++;
ip[i&7]=0;
break;
}
s += j+1;