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Fix the assert in bug 1776

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In the case where old_router == NULL but sdmap has an entry for the
router, we can currently safely infer that the old_router was not a
bridge.  Add an assert to ensure that this remains true, and fix the
logic not to die with the tor_assert(old_router) call.
This commit is contained in:
Nick Mathewson 2010-11-02 11:20:09 -04:00
parent 213139f887
commit 114a371c0e
2 changed files with 17 additions and 5 deletions
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5
changes/bug1776_redux Normal file
View File

@ -0,0 +1,5 @@
o Major bugfixes
- Avoid an assertion failure when we as an authority receive a
duplicate upload of a router descriptor that we already have,
but which we previously considered an obsolete descriptor.
Fixes another case of bug 1776. Bugfix on 0.2.2.16-alpha.

17
src/or/routerlist.c
View File

@ -2661,12 +2661,15 @@ signed_descriptor_free(signed_descriptor_t *sd)
tor_free(sd);
}
/** Extract a signed_descriptor_t from a routerinfo, and free the routerinfo.
/** Extract a signed_descriptor_t from a general routerinfo, and free the
* routerinfo.
*/
static signed_descriptor_t *
signed_descriptor_from_routerinfo(routerinfo_t *ri)
{
signed_descriptor_t *sd = tor_malloc_zero(sizeof(signed_descriptor_t));
signed_descriptor_t *sd;
tor_assert(ri->purpose == ROUTER_PURPOSE_GENERAL);
sd = tor_malloc_zero(sizeof(signed_descriptor_t));
memcpy(sd, &(ri->cache_info), sizeof(signed_descriptor_t));
sd->routerlist_index = -1;
ri->cache_info.signed_descriptor_body = NULL;
@ -3209,10 +3212,14 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg,
/* If we have this descriptor already and the new descriptor is a bridge
* descriptor, replace it. If we had a bridge descriptor before and the
* new one is not a bridge descriptor, don't replace it. */
tor_assert(old_router);
/* Only members of routerlist->identity_map can be bridges; we don't
* put bridges in old_routers. */
const int was_bridge = old_router &&
old_router->purpose == ROUTER_PURPOSE_BRIDGE;
if (! (routerinfo_is_a_configured_bridge(router) &&
(router->purpose == ROUTER_PURPOSE_BRIDGE ||
old_router->purpose != ROUTER_PURPOSE_BRIDGE))) {
(router->purpose == ROUTER_PURPOSE_BRIDGE || !was_bridge))) {
log_info(LD_DIR,
"Dropping descriptor that we already have for router '%s'",
router->nickname);