validate whether addr is null before constructing slice

src/addr_validate.rs

@@ -59,6 +59,10 @@ fn open_pipe() -> nix::Result<()> {
 }
 
 pub fn validate(addr: *const libc::c_void) -> bool {
+    if addr.is_null() {
+        return false;
+    }
+
     const CHECK_LENGTH: usize = 2 * size_of::<*const libc::c_void>() / size_of::<u8>();
 
     // read data in the pipe

src/collector.rs

@@ -37,7 +37,7 @@ pub struct Bucket<T: 'static> {
 
 impl<T: Eq + Default> Default for Bucket<T> {
     fn default() -> Bucket<T> {
-        let entries = Box::new(Default::default());
+        let entries = Box::default();
 
         Self { length: 0, entries }
     }

src/frames.rs

@@ -18,7 +18,7 @@ pub struct UnresolvedFrames {
     pub frames: SmallVec<[<TraceImpl as Trace>::Frame; MAX_DEPTH]>,
     pub thread_name: [u8; MAX_THREAD_NAME],
     pub thread_name_length: usize,
-    pub thread_id: u64,
+    pub thread_id: libc::pthread_t,
     pub sample_timestamp: SystemTime,
 }
 
@@ -45,7 +45,7 @@ impl UnresolvedFrames {
     pub fn new(
         frames: SmallVec<[<TraceImpl as Trace>::Frame; MAX_DEPTH]>,
         tn: &[u8],
-        thread_id: u64,
+        thread_id: libc::pthread_t,
         sample_timestamp: SystemTime,
     ) -> Self {
         let thread_name_length = tn.len();
@@ -168,7 +168,7 @@ impl Hash for Symbol {
 pub struct Frames {
     pub frames: Vec<Vec<Symbol>>,
     pub thread_name: String,
-    pub thread_id: u64,
+    pub thread_id: libc::pthread_t,
     pub sample_timestamp: SystemTime,
 }
 

src/profiler.rs

@@ -358,7 +358,7 @@ extern "C" fn perf_signal_handler(
             write_thread_name(current_thread, &mut name);
 
             let name = unsafe { std::ffi::CStr::from_ptr(name_ptr) };
-            profiler.sample(bt, name.to_bytes(), current_thread as u64, sample_timestamp);
+            profiler.sample(bt, name.to_bytes(), current_thread, sample_timestamp);
         }
     }
 }
@@ -455,7 +455,7 @@ impl Profiler {
         &mut self,
         backtrace: SmallVec<[<TraceImpl as Trace>::Frame; MAX_DEPTH]>,
         thread_name: &[u8],
-        thread_id: u64,
+        thread_id: libc::pthread_t,
         sample_timestamp: SystemTime,
     ) {
         let frames = UnresolvedFrames::new(backtrace, thread_name, thread_id, sample_timestamp);

src/report.rs

@@ -229,7 +229,7 @@ mod protobuf {
         /// `pprof` will generate google's pprof format report.
         pub fn pprof(&self) -> crate::Result<protos::Profile> {
             let mut dedup_str = HashSet::new();
-            for key in self.data.iter().map(|(key, _)| key) {
+            for key in self.data.keys() {
                 dedup_str.insert(key.thread_name_or_id());
                 for frame in key.frames.iter() {
                     for symbol in frame {