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[tor-commits] [tor/release-0.3.5] Set 'routerlist' global to NULL before freeing it.
commit a9379d6750d025d8bfe54a79c26e89eb45393f3a
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Fri Jul 19 09:49:52 2019 -0400
Set 'routerlist' global to NULL before freeing it.
There is other code that uses this value, and some of it is
apparently reachable from inside router_dir_info_changed(), which
routerlist_free() apparently calls. (ouch!) This is a minimal fix
to try to resolve the issue without causing other problems.
Fixes bug 31003. I'm calling this a bugfix on 0.1.2.2-alpha, where
the call to router_dir_info_changed() was added to routerlist_free().
---
changes/bug31003 | 4 ++++
src/feature/nodelist/routerlist.c | 12 ++++++------
2 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/changes/bug31003 b/changes/bug31003
new file mode 100644
index 000000000..6c7516338
--- /dev/null
+++ b/changes/bug31003
@@ -0,0 +1,4 @@
+ o Minor bugfixes (crash on exit):
+ - Avoid a set of possible code paths that could use try to use freed memory
+ in routerlist_free() while Tor was exiting. Fixes bug 31003; bugfix on
+ 0.1.2.2-alpha.
diff --git a/src/feature/nodelist/routerlist.c b/src/feature/nodelist/routerlist.c
index 4a99427cd..61af09742 100644
--- a/src/feature/nodelist/routerlist.c
+++ b/src/feature/nodelist/routerlist.c
@@ -954,20 +954,18 @@ routerlist_free_(routerlist_t *rl)
smartlist_free(rl->routers);
smartlist_free(rl->old_routers);
if (rl->desc_store.mmap) {
- int res = tor_munmap_file(routerlist->desc_store.mmap);
+ int res = tor_munmap_file(rl->desc_store.mmap);
if (res != 0) {
log_warn(LD_FS, "Failed to munmap routerlist->desc_store.mmap");
}
}
if (rl->extrainfo_store.mmap) {
- int res = tor_munmap_file(routerlist->extrainfo_store.mmap);
+ int res = tor_munmap_file(rl->extrainfo_store.mmap);
if (res != 0) {
log_warn(LD_FS, "Failed to munmap routerlist->extrainfo_store.mmap");
}
}
tor_free(rl);
-
- router_dir_info_changed();
}
/** Log information about how much memory is being used for routerlist,
@@ -1426,8 +1424,10 @@ routerlist_reparse_old(routerlist_t *rl, signed_descriptor_t *sd)
void
routerlist_free_all(void)
{
- routerlist_free(routerlist);
- routerlist = NULL;
+ routerlist_t *rl = routerlist;
+ routerlist = NULL; // Prevent internals of routerlist_free() from using
+ // routerlist.
+ routerlist_free(rl);
dirlist_free_all();
if (warned_nicknames) {
SMARTLIST_FOREACH(warned_nicknames, char *, cp, tor_free(cp));
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