diff options
| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-01-24 07:00:45 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-24 08:01:09 -0800 |
| commit | fabe874a48de45b137f99b4ed3641e0413f465ce (patch) | |
| tree | 815204d845875bd14f5623766b2ec5bc6f1fe00c | |
| parent | 4784b11c4f49eb88f2dd74df6afc5170f193cedc (diff) | |
lockdep: fix kernel crash on module unload
Michael Wu noticed in his lkml post at
http://marc.info/?l=linux-kernel&m=119396182726091&w=2
that certain wireless drivers ended up having their name in module
memory, which would then crash the kernel on module unload.
The patch he proposed was a bit clumsy in that it increased the size of
a lockdep entry significantly; the patch below tries another approach,
it checks, on module teardown, if the name of a class is in module space
and then zaps the class. This is very similar to what we already do
with keys that are in module space.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/lockdep.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 4335f12a27c..e2c07ece367 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -2932,7 +2932,7 @@ static void zap_class(struct lock_class *class) } -static inline int within(void *addr, void *start, unsigned long size) +static inline int within(const void *addr, void *start, unsigned long size) { return addr >= start && addr < start + size; } @@ -2955,9 +2955,12 @@ void lockdep_free_key_range(void *start, unsigned long size) head = classhash_table + i; if (list_empty(head)) continue; - list_for_each_entry_safe(class, next, head, hash_entry) + list_for_each_entry_safe(class, next, head, hash_entry) { if (within(class->key, start, size)) zap_class(class); + else if (within(class->name, start, size)) + zap_class(class); + } } if (locked) |