[SVN-4782] Using (const char*)1 in Apache HTTP server modules as value for r->notes cause httpd to crash

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.9.x, trunk, 1.10.x, 1.11.x
• Labels: patch

Environment

All environments

• Assignee: Unassigned
• Reporter: Ruediger Pluem
• Created: 29/Oct/18 08:00
• Updated: 30/Oct/18 20:51
• Resolved: 30/Oct/18 20:51

Description

mod_authz_svn.c and mod_dav_svn.c add keys to r->notes to memorize boolean states (FORCE_AUTHN_NOTE, IN_SOME_AUTHN_NOTE, authz_svn-anon-ok, NO_MAP_TO_STORAGE_NOTE). They use (const char*)1 as values for the keys. This causes any call to apr_table_clone for r->notes to crash with a SEGFAULT, because (const char*)1 is an invalid address. mod_http2 in httpd calls apr_table_clone for r->notes and hence the httpd process crashes. The attached patch (against trunk) replaces the value of  (const char*)1 in these cases with a value of "1".