redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

x86: uv: xpc NULL deref when mesq becomes empty

Browse source 
Under heavy load conditions, our set of xpc messages may become exhausted.
 The code handles this correctly with the exception of the management code
which hits a NULL pointer dereference.

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Robin Holt 2009-12-15 16:47:57 -08:00 committed by Linus Torvalds
parent c2c9f11574
commit 15b87d67ff
1 changed files with 5 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/misc/sgi-xp/xpc_uv.c
View file

@ -949,11 +949,13 @@ xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
head->first = first->next;
if (head->first == NULL)
head->last = NULL;
}
head->n_entries--;
BUG_ON(head->n_entries < 0);
spin_unlock_irqrestore(&head->lock, irq_flags);
first->next = NULL;
}
spin_unlock_irqrestore(&head->lock, irq_flags);
return first;
}