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lib: net_utils: make string_to_ip stricter

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Previously values greater than 255 were implicitly truncated. Add some
stricter checking to reject addresses with components >255.

With the input "1234192.168.1.1" the old behaviour would truncate the
address to 192.168.1.1. New behaviour rejects the string outright and
returns 0.0.0.0, which for the purposes of IP addresses can be
considered an error.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
This commit is contained in:
Chris Packham
2017-01-04 13:36:25 +13:00
committed by Tom Rini
parent 266aa86b04
commit d921ed9a2a
1 changed files with 4 additions and 0 deletions
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4
lib/net_utils.c
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@@ -24,6 +24,10 @@ struct in_addr string_to_ip(const char *s)
for (addr.s_addr = 0, i = 0; i < 4; ++i) {
ulong val = s ? simple_strtoul(s, &e, 10) : 0;
if (val > 255) {
addr.s_addr = 0;
return addr;
}
addr.s_addr <<= 8;
addr.s_addr |= (val & 0xFF);
if (s) {