On 06/22/2016 01:37 PM, Laine Stump wrote:
There are times when we don't have a netmask pointer to give to virSocketAddrGetIPPrefix() (e.g. the IP addresses in domain interfaces only have a prefix, no netmask), but it would have caused a segv if we called it with NULL instead of a pointer to a netmask. This patch qualifies the code that would use the netmask or address pointers to check for NULL first. --- src/util/virsocketaddr.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
According to how I read the commit message, "today" it could only be possible to have a NULL netmask if prefix was set. If prefix was set, then the following code returns prefix immediately. So I don't have anything against the extra checks - perhaps a few extra words either in comments or commit regarding is something existing or something that could be a truism in the future where prefix == 0 and either netmask or address is NULL. Of course I have a feeling I'm being set up for something soon ;-) ACK - John
diff --git a/src/util/virsocketaddr.c b/src/util/virsocketaddr.c index 12fe96a..33b1e9e 100644 --- a/src/util/virsocketaddr.c +++ b/src/util/virsocketaddr.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2009-2015 Red Hat, Inc. + * Copyright (C) 2009-2016 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -1026,9 +1026,9 @@ virSocketAddrGetIPPrefix(const virSocketAddr *address, { if (prefix > 0) { return prefix; - } else if (VIR_SOCKET_ADDR_VALID(netmask)) { + } else if (netmask && VIR_SOCKET_ADDR_VALID(netmask)) { return virSocketAddrGetNumNetmaskBits(netmask); - } else if (VIR_SOCKET_ADDR_IS_FAMILY(address, AF_INET)) { + } else if (address && VIR_SOCKET_ADDR_IS_FAMILY(address, AF_INET)) { /* Return the natural prefix for the network's ip address. * On Linux we could use the IN_CLASSx() macros, but those * aren't guaranteed on all platforms, so we just deal with @@ -1053,7 +1053,7 @@ virSocketAddrGetIPPrefix(const virSocketAddr *address, return 24; } return -1; - } else if (VIR_SOCKET_ADDR_IS_FAMILY(address, AF_INET6)) { + } else if (address && VIR_SOCKET_ADDR_IS_FAMILY(address, AF_INET6)) { if (virSocketAddrIsWildcard(address)) return 0; return 64;