Jan 07 2013

crypto: bfin_crc – reposition free_irq to avoid access to invalid data 

Author: Julia Lawall <Julia.Lawall@lip6.fr>

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/)

// 
@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);
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Herbert Xu 

---
 drivers/crypto/bfin_crc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
 
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 @@ out_error_dma:
 		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 @@ static int __devexit bfin_crypto_crc_remove(struct platform_device *pdev)
 
 	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;

qlambert