🐛 fix alexcrichton#71 avoid free null pointer

Ayush1325 · Oct 7, 2023 · dc833bc · dc833bc
1 parent 9d10f97
commit dc833bc
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/liblzma-sys/src/wasm_shim.rs b/liblzma-sys/src/wasm_shim.rs
@@ -19,6 +19,9 @@ pub extern "C" fn rust_lzma_wasm_shim_calloc(nmemb: usize, size: usize) -> *mut
 
 #[no_mangle]
 pub unsafe extern "C" fn rust_lzma_wasm_shim_free(ptr: *mut c_void) {
+    if ptr == std::ptr::null_mut() {
+        return;
+    }
     // layout is not actually used
     let layout = Layout::from_size_align_unchecked(1, 1);
     dealloc(ptr.cast(), layout);