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authorSteven Rostedt <srostedt@redhat.com>2011-07-05 14:32:51 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-04 21:58:38 -0700
commitff7b3dc6a634832a912445db8bffd18b05c15043 (patch)
treef43c5cd10398a1c91f8ff6b061a8b663663d84fb /lib
parentf35869d69b65ac9323a0d7ee13c062e1636d4a1b (diff)
tracing: Have "enable" file use refcounts like the "filter" file
commit 40ee4dffff061399eb9358e0c8fcfbaf8de4c8fe upstream. The "enable" file for the event system can be removed when a module is unloaded and the event system only has events from that module. As the event system nr_events count goes to zero, it may be freed if its ref_count is also set to zero. Like the "filter" file, the "enable" file may be opened by a task and referenced later, after a module has been unloaded and the events for that event system have been removed. Although the "filter" file referenced the event system structure, the "enable" file only references a pointer to the event system name. Since the name is freed when the event system is removed, it is possible that an access to the "enable" file may reference a freed pointer. Update the "enable" file to use the subsystem_open() routine that the "filter" file uses, to keep a reference to the event system structure while the "enable" file is opened. Reported-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions