Merge remote branch 'origin/master' of /home/airlied/kernel//linux-2.6 into drm-core-next

1 files changed, 25 insertions, 18 deletions

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 8b27c9849b42..544301d29dee 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -514,8 +514,8 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
                                 struct pt_regs *regs);
 
-/* Check the name is good for event/group */
-static int check_event_name(const char *name)
+/* Check the name is good for event/group/fields */
+static int is_good_name(const char *name)
 {
         if (!isalpha(*name) && *name != '_')
                 return 0;
@@ -557,7 +557,7 @@ static struct trace_probe *alloc_trace_probe(const char *group,
         else
                 tp->rp.kp.pre_handler = kprobe_dispatcher;
 
-        if (!event || !check_event_name(event)) {
+        if (!event || !is_good_name(event)) {
                 ret = -EINVAL;
                 goto error;
         }
@@ -567,7 +567,7 @@ static struct trace_probe *alloc_trace_probe(const char *group,
         if (!tp->call.name)
                 goto error;
 
-        if (!group || !check_event_name(group)) {
+        if (!group || !is_good_name(group)) {
                 ret = -EINVAL;
                 goto error;
         }
@@ -883,7 +883,7 @@ static int create_trace_probe(int argc, char **argv)
         int i, ret = 0;
         int is_return = 0, is_delete = 0;
         char *symbol = NULL, *event = NULL, *group = NULL;
-        char *arg, *tmp;
+        char *arg;
         unsigned long offset = 0;
         void *addr = NULL;
         char buf[MAX_EVENT_NAME_LEN];
@@ -992,26 +992,36 @@ static int create_trace_probe(int argc, char **argv)
         /* parse arguments */
         ret = 0;
         for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+                /* Increment count for freeing args in error case */
+                tp->nr_args++;
+
                 /* Parse argument name */
                 arg = strchr(argv[i], '=');
-                if (arg)
+                if (arg) {
                         *arg++ = '\0';
-                else
+                        tp->args[i].name = kstrdup(argv[i], GFP_KERNEL);
+                } else {
                         arg = argv[i];
+                        /* If argument name is omitted, set "argN" */
+                        snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
+                        tp->args[i].name = kstrdup(buf, GFP_KERNEL);
+                }
 
-                tp->args[i].name = kstrdup(argv[i], GFP_KERNEL);
                 if (!tp->args[i].name) {
-                        pr_info("Failed to allocate argument%d name '%s'.\n",
-                                i, argv[i]);
+                        pr_info("Failed to allocate argument[%d] name.\n", i);
                         ret = -ENOMEM;
                         goto error;
                 }
-                tmp = strchr(tp->args[i].name, ':');
-                if (tmp)
-                        *tmp = '_';     /* convert : to _ */
+
+                if (!is_good_name(tp->args[i].name)) {
+                        pr_info("Invalid argument[%d] name: %s\n",
+                                i, tp->args[i].name);
+                        ret = -EINVAL;
+                        goto error;
+                }
 
                 if (conflict_field_name(tp->args[i].name, tp->args, i)) {
-                        pr_info("Argument%d name '%s' conflicts with "
+                        pr_info("Argument[%d] name '%s' conflicts with "
                                 "another field.\n", i, argv[i]);
                         ret = -EINVAL;
                         goto error;
@@ -1020,12 +1030,9 @@ static int create_trace_probe(int argc, char **argv)
                 /* Parse fetch argument */
                 ret = parse_probe_arg(arg, tp, &tp->args[i], is_return);
                 if (ret) {
-                        pr_info("Parse error at argument%d. (%d)\n", i, ret);
-                        kfree(tp->args[i].name);
+                        pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
                         goto error;
                 }
-
-                tp->nr_args++;
         }
 
         ret = register_trace_probe(tp);