netfilter: x_tables: misuse of try_then_request_module
Since xt_find_match() returns ERR_PTR(xx) on error not NULL,
the macro try_then_request_module won't work correctly here.
The macro expects its first argument will be zero if condition
fails. But ERR_PTR(-ENOENT) is not zero.
The correct solution is to propagate the error value
back.
Found by inspection, and compile tested only.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 0a77d2f..271eed3 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -183,7 +183,7 @@
/*
* These are weird, but module loading must not be done with mutex
* held (since they will register), and we have to have a single
- * function to use try_then_request_module().
+ * function to use.
*/
/* Find match, grabs ref. Returns ERR_PTR() on error. */
@@ -221,9 +221,13 @@
{
struct xt_match *match;
- match = try_then_request_module(xt_find_match(nfproto, name, revision),
- "%st_%s", xt_prefix[nfproto], name);
- return (match != NULL) ? match : ERR_PTR(-ENOENT);
+ match = xt_find_match(nfproto, name, revision);
+ if (IS_ERR(match)) {
+ request_module("%st_%s", xt_prefix[nfproto], name);
+ match = xt_find_match(nfproto, name, revision);
+ }
+
+ return match;
}
EXPORT_SYMBOL_GPL(xt_request_find_match);
@@ -261,9 +265,13 @@
{
struct xt_target *target;
- target = try_then_request_module(xt_find_target(af, name, revision),
- "%st_%s", xt_prefix[af], name);
- return (target != NULL) ? target : ERR_PTR(-ENOENT);
+ target = xt_find_target(af, name, revision);
+ if (IS_ERR(target)) {
+ request_module("%st_%s", xt_prefix[af], name);
+ target = xt_find_target(af, name, revision);
+ }
+
+ return target;
}
EXPORT_SYMBOL_GPL(xt_request_find_target);