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authorSteven Rostedt <srostedt@redhat.com>2011-07-05 14:32:51 -0400
committerJonas ABERG <jonas.aberg@stericsson.com>2011-10-28 11:11:55 +0200
commitf49deea54a64ad17342e3fa1e2405c1184e25ce2 (patch)
treef8b3cc87b36a9b8d613605ba6965d669600c3d71 /include/trace
parente6c7ca6fa310b5aece6b52af8de3f3af09ba276a (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> Change-Id: I46951b3d423d7eee29dfee3abde606cb9c90520b Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/35639 Tested-by: Per VAHLNE <per.xx.vahlne@stericsson.com> Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Diffstat (limited to 'include/trace')
0 files changed, 0 insertions, 0 deletions