Backport fixes introduced in 2.63.6 for memory leaks and memory corruption in GMainContext
Upstream merge: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1353 Fixes SIGSEGV in GStreamer: Thread 2 "multihandlesink" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7ffff6bb9700 (LWP 18045)] 0x00007ffff7d65992 in g_source_unref_internal (source=0x7ffff00047d0, context=0x55555561c800, have_lock=1) at ../../../../../../../repo/workspace/sources/glib-2.0/glib/gmain.c:2146 2146 ../../../../../../../repo/workspace/sources/glib-2.0/glib/gmain.c: No such file or directory. (gdb) bt #0 0x00007ffff7d65992 in g_source_unref_internal (source=0x7ffff00047d0, context=0x55555561c800, have_lock=1) at ../../../../../../../repo/workspace/sources/glib-2.0/glib/gmain.c:2146 #1 0x00007ffff7d65bb6 in g_source_iter_next (iter=iter@entry=0x7ffff6bb8db0, source=source@entry=0x7ffff6bb8da8) at ../../../../../../../repo/workspace/sources/glib-2.0/glib/gmain.c:980 #2 0x00007ffff7d67ef3 in g_main_context_prepare (context=context@entry=0x55555561c800, priority=priority@entry=0x7ffff6bb8e30) at ../../../../../../../repo/workspace/sources/glib-2.0/glib/gmain.c:944 #3 0x00007ffff7d6896b in g_main_context_iterate (context=context@entry=0x55555561c800, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../../../../repo/workspace/sources/glib-2.0/glib/gmain.c:3900 #4 0x00007ffff7d68b4c in g_main_context_iteration (context=0x55555561c800, may_block=may_block@entry=1) at ../../../../../../../repo/workspace/sources/glib-2.0/glib/gmain.c:3981 #5 0x00007ffff6be4482 in gst_multi_socket_sink_thread (mhsink=0x555555679ab0 [GstMultiSocketSink]) at ../../../gst-plugins-base-1.14.4/gst/tcp/gstmultisocketsink.c:1164 #6 0x00007ffff7d8fb35 in g_thread_proxy (data=0x55555565c770) at ../../../../../../../repo/workspace/sources/glib-2.0/glib/gthread.c:784 #7 0x00007ffff7841ebd in start_thread (arg=<optimized out>) at pthread_create.c:486 #8 0x00007ffff7aa12bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 #8 0x00007ffff7aa12bf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Signed-off-by: Daniel Gomez <dan...@qtec.com> --- ...-GSource-iterator-if-iteration-can-m.patch | 43 +++++++ ...-memory-leaks-and-memory-corruption-.patch | 109 ++++++++++++++++++ ...e-mutex-unlocking-in-destructor-righ.patch | 36 ++++++ meta/recipes-core/glib-2.0/glib-2.0_2.62.4.bb | 3 + 4 files changed, 191 insertions(+) create mode 100644 meta/recipes-core/glib-2.0/glib-2.0/0011-GMainContext-Fix-GSource-iterator-if-iteration-can-m.patch create mode 100644 meta/recipes-core/glib-2.0/glib-2.0/0012-GMainContext-Fix-memory-leaks-and-memory-corruption-.patch create mode 100644 meta/recipes-core/glib-2.0/glib-2.0/0013-GMainContext-Move-mutex-unlocking-in-destructor-righ.patch diff --git a/meta/recipes-core/glib-2.0/glib-2.0/0011-GMainContext-Fix-GSource-iterator-if-iteration-can-m.patch b/meta/recipes-core/glib-2.0/glib-2.0/0011-GMainContext-Fix-GSource-iterator-if-iteration-can-m.patch new file mode 100644 index 0000000000..3aae6f0c8c --- /dev/null +++ b/meta/recipes-core/glib-2.0/glib-2.0/0011-GMainContext-Fix-GSource-iterator-if-iteration-can-m.patch @@ -0,0 +1,43 @@ +From ef2be42998e3fc10299055a5a01f7c791538174c Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebast...@centricular.com> +Date: Mon, 3 Feb 2020 15:38:28 +0200 +Subject: [PATCH] GMainContext - Fix GSource iterator if iteration can modify + the list + +We first have to ref the next source and then unref the previous one. +This might be the last reference to the previous source, and freeing the +previous source might unref and free the next one which would then leave +use with a dangling pointer here. + +Fixes https://gitlab.gnome.org/GNOME/glib/issues/2031 + +Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/glib/-/commit/b06c48de7554607ff3fb58d6c0510cfa5088e909] + +--- + glib/gmain.c | 8 ++++++-- + 1 file changed, 6 insertions(+), 2 deletions(-) + +diff --git a/glib/gmain.c b/glib/gmain.c +index af979c8..a9a287d 100644 +--- a/glib/gmain.c ++++ b/glib/gmain.c +@@ -969,13 +969,17 @@ g_source_iter_next (GSourceIter *iter, GSource **source) + * GSourceList to be removed from source_lists (if iter->source is + * the only source in its list, and it is destroyed), so we have to + * keep it reffed until after we advance iter->current_list, above. ++ * ++ * Also we first have to ref the next source before unreffing the ++ * previous one as unreffing the previous source can potentially ++ * free the next one. + */ ++ if (next_source && iter->may_modify) ++ g_source_ref (next_source); + + if (iter->source && iter->may_modify) + g_source_unref_internal (iter->source, iter->context, TRUE); + iter->source = next_source; +- if (iter->source && iter->may_modify) +- g_source_ref (iter->source); + + *source = iter->source; + return *source != NULL; diff --git a/meta/recipes-core/glib-2.0/glib-2.0/0012-GMainContext-Fix-memory-leaks-and-memory-corruption-.patch b/meta/recipes-core/glib-2.0/glib-2.0/0012-GMainContext-Fix-memory-leaks-and-memory-corruption-.patch new file mode 100644 index 0000000000..8c025f7fc6 --- /dev/null +++ b/meta/recipes-core/glib-2.0/glib-2.0/0012-GMainContext-Fix-memory-leaks-and-memory-corruption-.patch @@ -0,0 +1,109 @@ +From 611430a32a46d0dc806a829161e2dccf9c0196a8 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebast...@centricular.com> +Date: Mon, 3 Feb 2020 15:35:51 +0200 +Subject: [PATCH] GMainContext - Fix memory leaks and memory corruption when + freeing sources while freeing a context + +Instead of destroying sources directly while freeing the context, and +potentially freeing them if this was the last reference to them, collect +new references of all sources in a separate list before and at the same +time invalidate their context so that they can't access it anymore. Only +once all sources have their context invalidated, destroy them while +still keeping a reference to them. Once all sources are destroyed we get +rid of the additional references and free them if nothing else keeps a +reference to them anymore. + +This fixes a regression introduced by 26056558be in 2012. + +The previous code that invalidated the context of each source and then +destroyed it before going to the next source without keeping an +additional reference caused memory leaks or memory corruption depending +on the order of the sources in the sources lists. + +If a source was destroyed it might happen that this was the last +reference to this source, and it would then be freed. This would cause +the finalize function to be called, which might destroy and unref +another source and potentially free it. This other source would then +either +- go through the normal free logic and change the intern linked list + between the sources, while other sources that are unreffed as part of + the main context freeing would not. As such the list would be in an + inconsistent state and we might dereference freed memory. +- go through the normal destroy and free logic but because the context + pointer was already invalidated it would simply mark the source as + destroyed without actually removing it from the context. This would + then cause a memory leak because the reference owned by the context is + not freed. + +Fixes https://github.com/gtk-rs/glib/issues/583 while still keeping +https://bugzilla.gnome.org/show_bug.cgi?id=661767 fixes. + +Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/glib/-/commit/aa20167d419c649f34fed06a9463890b41b1eba0] + +--- + glib/gmain.c | 35 ++++++++++++++++++++++++++++++++++- + 1 file changed, 34 insertions(+), 1 deletion(-) + +diff --git a/glib/gmain.c b/glib/gmain.c +index a9a287d..10ba2f8 100644 +--- a/glib/gmain.c ++++ b/glib/gmain.c +@@ -538,6 +538,7 @@ g_main_context_unref (GMainContext *context) + GSourceIter iter; + GSource *source; + GList *sl_iter; ++ GSList *s_iter, *remaining_sources = NULL; + GSourceList *list; + guint i; + +@@ -557,10 +558,30 @@ g_main_context_unref (GMainContext *context) + + /* g_source_iter_next() assumes the context is locked. */ + LOCK_CONTEXT (context); +- g_source_iter_init (&iter, context, TRUE); ++ ++ /* First collect all remaining sources from the sources lists and store a ++ * new reference in a separate list. Also set the context of the sources ++ * to NULL so that they can't access a partially destroyed context anymore. ++ * ++ * We have to do this first so that we have a strong reference to all ++ * sources and destroying them below does not also free them, and so that ++ * none of the sources can access the context from their finalize/dispose ++ * functions. */ ++ g_source_iter_init (&iter, context, FALSE); + while (g_source_iter_next (&iter, &source)) + { + source->context = NULL; ++ remaining_sources = g_slist_prepend (remaining_sources, g_source_ref (source)); ++ } ++ g_source_iter_clear (&iter); ++ ++ /* Next destroy all sources. As we still hold a reference to all of them, ++ * this won't cause any of them to be freed yet and especially prevents any ++ * source that unrefs another source from its finalize function to be freed. ++ */ ++ for (s_iter = remaining_sources; s_iter; s_iter = s_iter->next) ++ { ++ source = s_iter->data; + g_source_destroy_internal (source, context, TRUE); + } + UNLOCK_CONTEXT (context); +@@ -585,6 +606,18 @@ g_main_context_unref (GMainContext *context) + g_cond_clear (&context->cond); + + g_free (context); ++ ++ /* And now finally get rid of our references to the sources. This will cause ++ * them to be freed unless something else still has a reference to them. Due ++ * to setting the context pointers in the sources to NULL above, this won't ++ * ever access the context or the internal linked list inside the GSource. ++ * We already removed the sources completely from the context above. */ ++ for (s_iter = remaining_sources; s_iter; s_iter = s_iter->next) ++ { ++ source = s_iter->data; ++ g_source_unref_internal (source, NULL, FALSE); ++ } ++ g_slist_free (remaining_sources); + } + + /* Helper function used by mainloop/overflow test. diff --git a/meta/recipes-core/glib-2.0/glib-2.0/0013-GMainContext-Move-mutex-unlocking-in-destructor-righ.patch b/meta/recipes-core/glib-2.0/glib-2.0/0013-GMainContext-Move-mutex-unlocking-in-destructor-righ.patch new file mode 100644 index 0000000000..b10ba0066e --- /dev/null +++ b/meta/recipes-core/glib-2.0/glib-2.0/0013-GMainContext-Move-mutex-unlocking-in-destructor-righ.patch @@ -0,0 +1,36 @@ +From 3e9d85f1b75e2b1096d9643563d7d17380752fc7 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebast...@centricular.com> +Date: Tue, 11 Feb 2020 09:34:38 +0200 +Subject: [PATCH] GMainContext - Move mutex unlocking in destructor right + before freeing the mutex + +This does not have any behaviour changes but is cleaner. The mutex is +only unlocked now after all operations on the context are done and right +before freeing the mutex and the context itself. + +Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/glib/-/commit/730a75fc8e8271c38fbd5363d1f77a00876b9ddc] + +--- + glib/gmain.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/glib/gmain.c b/glib/gmain.c +index 10ba2f8..b1df470 100644 +--- a/glib/gmain.c ++++ b/glib/gmain.c +@@ -584,7 +584,6 @@ g_main_context_unref (GMainContext *context) + source = s_iter->data; + g_source_destroy_internal (source, context, TRUE); + } +- UNLOCK_CONTEXT (context); + + for (sl_iter = context->source_lists; sl_iter; sl_iter = sl_iter->next) + { +@@ -595,6 +594,7 @@ g_main_context_unref (GMainContext *context) + + g_hash_table_destroy (context->sources); + ++ UNLOCK_CONTEXT (context); + g_mutex_clear (&context->mutex); + + g_ptr_array_free (context->pending_dispatches, TRUE); diff --git a/meta/recipes-core/glib-2.0/glib-2.0_2.62.4.bb b/meta/recipes-core/glib-2.0/glib-2.0_2.62.4.bb index 5ed3b4e871..d496235003 100644 --- a/meta/recipes-core/glib-2.0/glib-2.0_2.62.4.bb +++ b/meta/recipes-core/glib-2.0/glib-2.0_2.62.4.bb @@ -16,6 +16,9 @@ SRC_URI = "${GNOME_MIRROR}/glib/${SHRT_VER}/glib-${PV}.tar.xz \ file://0001-Do-not-write-bindir-into-pkg-config-files.patch \ file://0001-meson-Run-atomics-test-on-clang-as-well.patch \ file://0001-gio-tests-resources.c-comment-out-a-build-host-only-.patch \ + file://0011-GMainContext-Fix-GSource-iterator-if-iteration-can-m.patch \ + file://0012-GMainContext-Fix-memory-leaks-and-memory-corruption-.patch \ + file://0013-GMainContext-Move-mutex-unlocking-in-destructor-righ.patch \ " SRC_URI_append_class-native = " file://relocate-modules.patch" -- 2.25.1
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