x86: uv: xpc NULL deref when mesq becomes empty
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>
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1 changed files with 5 additions and 3 deletions
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@ -949,11 +949,13 @@ xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
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head->first = first->next;
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if (head->first == NULL)
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head->last = NULL;
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head->n_entries--;
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BUG_ON(head->n_entries < 0);
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first->next = NULL;
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}
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head->n_entries--;
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BUG_ON(head->n_entries < 0);
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spin_unlock_irqrestore(&head->lock, irq_flags);
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first->next = NULL;
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return first;
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}
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