tools/liblockdep: Fix debug_check thinko in mutex destroy

In mutex destroy code currently we pass to debug_check_no_locks_freed()

    [mem_from, mem_end)

address region. But debug_check_no_locks_freed() accepts

    mem_from, mem_*len*

i.e. second parameter is region length, not end address. And it was
always so, starting from 2006 (fbb9ce95 "lockdep: core").

Fix it, or else on a mutex destroy we wrongly check
much-wider-than-mutex region and can find not-yet-released other locks
there and wrongly report BUGs on them.

Signed-off-by: Kirill Smelkov <kirr@nexedi.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/tools/lib/lockdep/preload.c b/tools/lib/lockdep/preload.c
index 6f803609e498246d277d35829b18c7924a136eca..0b0112c80f22b390875799909ab567b42c66009e 100644 (file)
--- a/tools/lib/lockdep/preload.c
+++ b/tools/lib/lockdep/preload.c
@@ -317,7 +317,7 @@ int pthread_mutex_destroy(pthread_mutex_t *mutex)
         *
         * TODO: Hook into free() and add that check there as well.
         */
-       debug_check_no_locks_freed(mutex, mutex + sizeof(*mutex));
+       debug_check_no_locks_freed(mutex, sizeof(*mutex));
        __del_lock(__get_lock(mutex));
        return ll_pthread_mutex_destroy(mutex);
 }
@@ -341,7 +341,7 @@ int pthread_rwlock_destroy(pthread_rwlock_t *rwlock)
 {
        try_init_preload();
 
-       debug_check_no_locks_freed(rwlock, rwlock + sizeof(*rwlock));
+       debug_check_no_locks_freed(rwlock, sizeof(*rwlock));
        __del_lock(__get_lock(rwlock));
        return ll_pthread_rwlock_destroy(rwlock);
 }