https://github.com/python/cpython/commit/800d37feca2e0ea3343995b3b817b653db2f9034
commit: 800d37feca2e0ea3343995b3b817b653db2f9034
branch: main
author: Hood Chatham <[email protected]>
committer: ambv <[email protected]>
date: 2025-07-19T21:43:50+02:00
summary:
gh-124621: Emscripten: Fix regression in use-after-close error handling
(#136837)
files:
M Python/emscripten_syscalls.c
diff --git a/Python/emscripten_syscalls.c b/Python/emscripten_syscalls.c
index bd5cc07071f20e..886262acbc6810 100644
--- a/Python/emscripten_syscalls.c
+++ b/Python/emscripten_syscalls.c
@@ -148,10 +148,17 @@ EM_JS_MACROS(__externref_t, __maybe_fd_read_async, (
size_t iovcnt,
__wasi_size_t *nread
), {
- var stream = SYSCALLS.getStreamFromFD(fd);
if (!WebAssembly.promising) {
return null;
}
+ var stream;
+ try {
+ stream = SYSCALLS.getStreamFromFD(fd);
+ } catch (e) {
+ // If the fd was already closed or never existed, getStreamFromFD()
+ // raises. We'll let fd_read_orig() handle setting errno.
+ return null;
+ }
if (!stream.stream_ops.readAsync) {
// Not an async device. Fall back to __wasi_fd_read_orig().
return null;
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