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[ifmgmt] Avoid relying on global variable within ifcommon_exec()

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The getopt API defines optind as a global variable.  When used by the
"autoboot" command, the payload function passed to ifcommon_exec() may
result in a new iPXE script being executed; the commands therein would
then overwrite the value of optind.  On returning, ifcommon_exec()
would continue processing the list of interfaces from an undefined
point.

Fix by using a local variable to hold the index within the list of
interfaces.

Reported-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2013-07-15 17:30:39 +02:00
parent 51d14424bf
commit ed28c8304c
1 changed files with 3 additions and 4 deletions
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7
src/hci/commands/ifmgmt_cmd.c
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@ -53,6 +53,7 @@ int ifcommon_exec ( int argc, char **argv,
int stop_on_first_success ) {
struct ifcommon_options opts;
struct net_device *netdev;
int i;
int rc;
/* Parse options */
@ -61,11 +62,9 @@ int ifcommon_exec ( int argc, char **argv,
if ( optind != argc ) {
/* Treat arguments as a list of interfaces to try */
while ( optind != argc ) {
if ( ( rc = parse_netdev ( argv[optind++],
&netdev ) ) != 0 ) {
for ( i = optind ; i < argc ; i++ ) {
if ( ( rc = parse_netdev ( argv[i], &netdev ) ) != 0 )
continue;
}
if ( ( ( rc = payload ( netdev ) ) == 0 ) &&
stop_on_first_success ) {
return 0;