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| author | Lukas Nykryn <lnykryn@redhat.com> | 2016-05-30 13:40:53 +0200 |
|---|---|---|
| committer | Dee'Kej <deekej@linuxmail.org> | 2016-11-10 16:56:42 +0100 |
| commit | fdad48ace9be9bd8f2dc1e969b7f6445fcada16e (patch) | |
| tree | 19a131c5c8df42222e3820eaaf4c6241f09e415b | |
| parent | 40e9e95a50891e04418fb5c0cbbe6a652ca784ea (diff) | |
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ipcalc: detect invalid mask
Resolves: RHBZ #1377986
| -rw-r--r-- | src/ipcalc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/ipcalc.c b/src/ipcalc.c index 83eb871d..bf4fa757 100644 --- a/src/ipcalc.c +++ b/src/ipcalc.c @@ -107,6 +107,8 @@ int mask2prefix(struct in_addr mask) uint32_t saddr = ntohl(mask.s_addr); for (count=0; saddr > 0; count++) { + if (!((1 << 31) & saddr)) + return -1; saddr=saddr << 1; } @@ -339,6 +341,11 @@ int main(int argc, const char **argv) { return 1; } prefix = mask2prefix(netmask); + if (prefix < 0 ) { + if (!beSilent) + fprintf(stderr, "ipcalc: bad netmask: %s\n", netmaskStr); + return 1; + } } } |