diff options
Diffstat (limited to '0044-tools-ocaml-libs-Fix-memory-resource-leaks-with-caml.patch')
| -rw-r--r-- | 0044-tools-ocaml-libs-Fix-memory-resource-leaks-with-caml.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/0044-tools-ocaml-libs-Fix-memory-resource-leaks-with-caml.patch b/0044-tools-ocaml-libs-Fix-memory-resource-leaks-with-caml.patch new file mode 100644 index 0000000..8876ab7 --- /dev/null +++ b/0044-tools-ocaml-libs-Fix-memory-resource-leaks-with-caml.patch @@ -0,0 +1,61 @@ +From 587823eca162d063027faf1826ec3544f0a06e78 Mon Sep 17 00:00:00 2001 +From: Andrew Cooper <andrew.cooper3@citrix.com> +Date: Wed, 1 Feb 2023 11:27:42 +0000 +Subject: [PATCH 44/89] tools/ocaml/libs: Fix memory/resource leaks with + caml_alloc_custom() + +All caml_alloc_*() functions can throw exceptions, and longjump out of +context. If this happens, we leak the xch/xce handle. + +Reorder the logic to allocate the the Ocaml object first. + +Fixes: 8b3c06a3e545 ("tools/ocaml/xenctrl: OCaml 5 support, fix use-after-free") +Fixes: 22d5affdf0ce ("tools/ocaml/evtchn: OCaml 5 support, fix potential resource leak") +Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> +Acked-by: Christian Lindig <christian.lindig@citrix.com> +(cherry picked from commit d69ccf52ad467ccc22029172a8e61dc621187889) +--- + tools/ocaml/libs/eventchn/xeneventchn_stubs.c | 6 ++++-- + 1 file changed, 4 insertions(+), 2 deletions(-) + +diff --git a/tools/ocaml/libs/eventchn/xeneventchn_stubs.c b/tools/ocaml/libs/eventchn/xeneventchn_stubs.c +index d7881ca95f..de2fc29292 100644 +--- a/tools/ocaml/libs/eventchn/xeneventchn_stubs.c ++++ b/tools/ocaml/libs/eventchn/xeneventchn_stubs.c +@@ -63,6 +63,8 @@ CAMLprim value stub_eventchn_init(value cloexec) + if ( !Bool_val(cloexec) ) + flags |= XENEVTCHN_NO_CLOEXEC; + ++ result = caml_alloc_custom(&xenevtchn_ops, sizeof(xce), 0, 1); ++ + caml_enter_blocking_section(); + xce = xenevtchn_open(NULL, flags); + caml_leave_blocking_section(); +@@ -70,7 +72,6 @@ CAMLprim value stub_eventchn_init(value cloexec) + if (xce == NULL) + caml_failwith("open failed"); + +- result = caml_alloc_custom(&xenevtchn_ops, sizeof(xce), 0, 1); + *(xenevtchn_handle **)Data_custom_val(result) = xce; + + CAMLreturn(result); +@@ -82,6 +83,8 @@ CAMLprim value stub_eventchn_fdopen(value fdval) + CAMLlocal1(result); + xenevtchn_handle *xce; + ++ result = caml_alloc_custom(&xenevtchn_ops, sizeof(xce), 0, 1); ++ + caml_enter_blocking_section(); + xce = xenevtchn_fdopen(NULL, Int_val(fdval), 0); + caml_leave_blocking_section(); +@@ -89,7 +92,6 @@ CAMLprim value stub_eventchn_fdopen(value fdval) + if (xce == NULL) + caml_failwith("evtchn fdopen failed"); + +- result = caml_alloc_custom(&xenevtchn_ops, sizeof(xce), 0, 1); + *(xenevtchn_handle **)Data_custom_val(result) = xce; + + CAMLreturn(result); +-- +2.40.0 + |