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authorJulia Lawall <Julia.Lawall@lip6.fr>2013-01-07 14:00:16 +0400
committerHerbert Xu <herbert@gondor.apana.org.au>2013-01-20 03:16:40 +0400
commit17bebdcd5c7c56cde82b8ccb02c5cea69e05f6d3 (patch)
tree4f2eb74f269a44c2961dc6f74c4572031fb32ef8 /drivers/crypto/bfin_crc.c
parentd20fb18be246d196225ed151c126832b2dab6506 (diff)
downloadlinux-17bebdcd5c7c56cde82b8ccb02c5cea69e05f6d3.tar.xz
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>
Diffstat (limited to 'drivers/crypto/bfin_crc.c')
-rw-r--r--drivers/crypto/bfin_crc.c6
1 files 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;