crypto: bfin_crc - reposition free_irq to avoid access to invalid data
The data referenced by an interrupt handler should not be freed before the
interrupt is ended. The handler is bfin_crypto_crc_handler. It may refer
to crc->regs, which is released by the iounmap.
Furthermore, the second argument to all calls to free_irq is incorrect. It
should be the same as the last argument of request_irq, which is crc,
rather than crc->dev.
The semantic match that finds the first problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@fn exists@
expression list es;
expression a,b;
identifier f;
@@
if (...) {
... when any
free_irq(a,b);
... when any
f(es);
... when any
return ...;
}
@@
expression list fn.es;
expression fn.a,fn.b;
identifier fn.f;
@@
*f(es);
... when any
*free_irq(a,b);
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/bfin_crc.c b/drivers/crypto/bfin_crc.c
index 5398580..06fa1e4 100644
--- a/drivers/crypto/bfin_crc.c
+++ b/drivers/crypto/bfin_crc.c
@@ -694,7 +694,7 @@
dma_free_coherent(&pdev->dev, PAGE_SIZE, crc->sg_cpu, crc->sg_dma);
free_dma(crc->dma_ch);
out_error_irq:
- free_irq(crc->irq, crc->dev);
+ free_irq(crc->irq, crc);
out_error_unmap:
iounmap((void *)crc->regs);
out_error_free_mem:
@@ -720,10 +720,10 @@
crypto_unregister_ahash(&algs);
tasklet_kill(&crc->done_task);
- iounmap((void *)crc->regs);
free_dma(crc->dma_ch);
if (crc->irq > 0)
- free_irq(crc->irq, crc->dev);
+ free_irq(crc->irq, crc);
+ iounmap((void *)crc->regs);
kfree(crc);
return 0;