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Diffstat (limited to 'kernel/trace/trace_ksym.c')
-rw-r--r--kernel/trace/trace_ksym.c56
1 files changed, 25 insertions, 31 deletions
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
index acb87d4a4ac1..faf37fa4408c 100644
--- a/kernel/trace/trace_ksym.c
+++ b/kernel/trace/trace_ksym.c
@@ -236,7 +236,8 @@ static ssize_t ksym_trace_filter_read(struct file *filp, char __user *ubuf,
mutex_lock(&ksym_tracer_mutex);
hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) {
- ret = trace_seq_printf(s, "%pS:", (void *)entry->attr.bp_addr);
+ ret = trace_seq_printf(s, "%pS:",
+ (void *)(unsigned long)entry->attr.bp_addr);
if (entry->attr.bp_type == HW_BREAKPOINT_R)
ret = trace_seq_puts(s, "r--\n");
else if (entry->attr.bp_type == HW_BREAKPOINT_W)
@@ -278,21 +279,20 @@ static ssize_t ksym_trace_filter_write(struct file *file,
{
struct trace_ksym *entry;
struct hlist_node *node;
- char *input_string, *ksymname = NULL;
+ char *buf, *input_string, *ksymname = NULL;
unsigned long ksym_addr = 0;
int ret, op, changed = 0;
- input_string = kzalloc(count + 1, GFP_KERNEL);
- if (!input_string)
+ buf = kzalloc(count + 1, GFP_KERNEL);
+ if (!buf)
return -ENOMEM;
- if (copy_from_user(input_string, buffer, count)) {
- kfree(input_string);
- return -EFAULT;
- }
- input_string[count] = '\0';
+ ret = -EFAULT;
+ if (copy_from_user(buf, buffer, count))
+ goto out;
- strstrip(input_string);
+ buf[count] = '\0';
+ input_string = strstrip(buf);
/*
* Clear all breakpoints if:
@@ -300,18 +300,16 @@ static ssize_t ksym_trace_filter_write(struct file *file,
* 2: echo 0 > ksym_trace_filter
* 3: echo "*:---" > ksym_trace_filter
*/
- if (!input_string[0] || !strcmp(input_string, "0") ||
- !strcmp(input_string, "*:---")) {
+ if (!buf[0] || !strcmp(buf, "0") ||
+ !strcmp(buf, "*:---")) {
__ksym_trace_reset();
- kfree(input_string);
- return count;
+ ret = 0;
+ goto out;
}
ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr);
- if (ret < 0) {
- kfree(input_string);
- return ret;
- }
+ if (ret < 0)
+ goto out;
mutex_lock(&ksym_tracer_mutex);
@@ -322,7 +320,7 @@ static ssize_t ksym_trace_filter_write(struct file *file,
if (entry->attr.bp_type != op)
changed = 1;
else
- goto out;
+ goto out_unlock;
break;
}
}
@@ -337,28 +335,24 @@ static ssize_t ksym_trace_filter_write(struct file *file,
if (IS_ERR(entry->ksym_hbp))
ret = PTR_ERR(entry->ksym_hbp);
else
- goto out;
+ goto out_unlock;
}
/* Error or "symbol:---" case: drop it */
ksym_filter_entry_count--;
hlist_del_rcu(&(entry->ksym_hlist));
synchronize_rcu();
kfree(entry);
- goto out;
+ goto out_unlock;
} else {
/* Check for malformed request: (4) */
- if (op == 0)
- goto out;
- ret = process_new_ksym_entry(ksymname, op, ksym_addr);
+ if (op)
+ ret = process_new_ksym_entry(ksymname, op, ksym_addr);
}
-out:
+out_unlock:
mutex_unlock(&ksym_tracer_mutex);
-
- kfree(input_string);
-
- if (!ret)
- ret = count;
- return ret;
+out:
+ kfree(buf);
+ return !ret ? count : ret;
}
static const struct file_operations ksym_tracing_fops = {