From 17bebdcd5c7c56cde82b8ccb02c5cea69e05f6d3 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Mon, 7 Jan 2013 11:00:16 +0100 Subject: [PATCH] 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/) // @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 5398580b4313..06fa1e4f49d3 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;