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-rw-r--r--kernel/params.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/kernel/params.c b/kernel/params.c
index a1e3025b19a9..de273ec85bd2 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -24,6 +24,9 @@
#include <linux/err.h>
#include <linux/slab.h>
+/* We abuse the high bits of "perm" to record whether we kmalloc'ed. */
+#define KPARAM_KMALLOCED 0x80000000
+
#if 0
#define DEBUGP printk
#else
@@ -217,7 +220,19 @@ int param_set_charp(const char *val, struct kernel_param *kp)
return -ENOSPC;
}
- *(char **)kp->arg = (char *)val;
+ if (kp->perm & KPARAM_KMALLOCED)
+ kfree(*(char **)kp->arg);
+
+ /* This is a hack. We can't need to strdup in early boot, and we
+ * don't need to; this mangled commandline is preserved. */
+ if (slab_is_available()) {
+ kp->perm |= KPARAM_KMALLOCED;
+ *(char **)kp->arg = kstrdup(val, GFP_KERNEL);
+ if (!kp->arg)
+ return -ENOMEM;
+ } else
+ *(const char **)kp->arg = val;
+
return 0;
}
@@ -571,6 +586,15 @@ void module_param_sysfs_remove(struct module *mod)
}
#endif
+void destroy_params(const struct kernel_param *params, unsigned num)
+{
+ unsigned int i;
+
+ for (i = 0; i < num; i++)
+ if (params[i].perm & KPARAM_KMALLOCED)
+ kfree(*(char **)params[i].arg);
+}
+
static void __init kernel_add_sysfs_param(const char *name,
struct kernel_param *kparam,
unsigned int name_skip)