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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2020-11-02 11:28:39 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-11-02 15:58:32 -0500
commit561ca66910bf597f170be5a7aa531c4e05f8e9be (patch)
treef8bb7cf306ea1514a1609212ee16061ee0bb27cd /kernel
parentb02414c8f045ab3b9afc816c3735bc98c5c3d262 (diff)
tracing: Make -ENOMEM the default error for parse_synth_field()
parse_synth_field() returns a pointer and requires that errors get surrounded by ERR_PTR(). The ret variable is initialized to zero, but should never be used as zero, and if it is, it could cause a false return code and produce a NULL pointer dereference. It makes no sense to set ret to zero. Set ret to -ENOMEM (the most common error case), and have any other errors set it to something else. This removes the need to initialize ret on *every* error branch. Fixes: 761a8c58db6b ("tracing, synthetic events: Replace buggy strcat() with seq_buf operations") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events_synth.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index 84b7cab55291..881df991742a 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -584,7 +584,7 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
{
struct synth_field *field;
const char *prefix = NULL, *field_type = argv[0], *field_name, *array;
- int len, ret = 0;
+ int len, ret = -ENOMEM;
struct seq_buf s;
ssize_t size;
@@ -617,10 +617,9 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
len--;
field->name = kmemdup_nul(field_name, len, GFP_KERNEL);
- if (!field->name) {
- ret = -ENOMEM;
+ if (!field->name)
goto free;
- }
+
if (!is_good_name(field->name)) {
synth_err(SYNTH_ERR_BAD_NAME, errpos(field_name));
ret = -EINVAL;
@@ -638,10 +637,9 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
len += strlen(prefix);
field->type = kzalloc(len, GFP_KERNEL);
- if (!field->type) {
- ret = -ENOMEM;
+ if (!field->type)
goto free;
- }
+
seq_buf_init(&s, field->type, len);
if (prefix)
seq_buf_puts(&s, prefix);
@@ -653,6 +651,7 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
}
if (WARN_ON_ONCE(!seq_buf_buffer_left(&s)))
goto free;
+
s.buffer[s.len] = '\0';
size = synth_field_size(field->type);
@@ -666,10 +665,8 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
len = sizeof("__data_loc ") + strlen(field->type) + 1;
type = kzalloc(len, GFP_KERNEL);
- if (!type) {
- ret = -ENOMEM;
+ if (!type)
goto free;
- }
seq_buf_init(&s, type, len);
seq_buf_puts(&s, "__data_loc ");