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authorChristoph Manszewski <c.manszewski@samsung.com>2018-09-17 17:09:27 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2018-09-28 12:46:06 +0800
commit5842cd44786055231b233ed5ed98cdb63ffb7db3 (patch)
tree31ad573373a4d3ccbc08f353988a9e2a595a1172 /drivers/crypto/s5p-sss.c
parentcd560235d8f9ddd94aa51e1c4dabdf3212b9b241 (diff)
downloadlinux-5842cd44786055231b233ed5ed98cdb63ffb7db3.tar.bz2
crypto: s5p-sss: Fix race in error handling
Remove a race condition introduced by error path in functions: s5p_aes_interrupt and s5p_aes_crypt_start. Setting the busy field of struct s5p_aes_dev to false made it possible for s5p_tasklet_cb to change the req field, before s5p_aes_complete was called. Change the first parameter of s5p_aes_complete to struct ablkcipher_request. Before spin_unlock, make a copy of the currently handled request, to ensure s5p_aes_complete function call with the correct request. Signed-off-by: Christoph Manszewski <c.manszewski@samsung.com> Acked-by: Kamil Konieczny <k.konieczny@partner.samsung.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/s5p-sss.c')
-rw-r--r--drivers/crypto/s5p-sss.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
index faa282074e5a..9021ad9df0c4 100644
--- a/drivers/crypto/s5p-sss.c
+++ b/drivers/crypto/s5p-sss.c
@@ -475,9 +475,9 @@ static void s5p_sg_done(struct s5p_aes_dev *dev)
}
/* Calls the completion. Cannot be called with dev->lock hold. */
-static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
+static void s5p_aes_complete(struct ablkcipher_request *req, int err)
{
- dev->req->base.complete(&dev->req->base, err);
+ req->base.complete(&req->base, err);
}
static void s5p_unset_outdata(struct s5p_aes_dev *dev)
@@ -655,6 +655,7 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
+ struct ablkcipher_request *req;
int err_dma_tx = 0;
int err_dma_rx = 0;
int err_dma_hx = 0;
@@ -727,7 +728,7 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
spin_unlock_irqrestore(&dev->lock, flags);
- s5p_aes_complete(dev, 0);
+ s5p_aes_complete(dev->req, 0);
/* Device is still busy */
tasklet_schedule(&dev->tasklet);
} else {
@@ -752,11 +753,12 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
error:
s5p_sg_done(dev);
dev->busy = false;
+ req = dev->req;
if (err_dma_hx == 1)
s5p_set_dma_hashdata(dev, dev->hash_sg_iter);
spin_unlock_irqrestore(&dev->lock, flags);
- s5p_aes_complete(dev, err);
+ s5p_aes_complete(req, err);
hash_irq_end:
/*
@@ -1983,7 +1985,7 @@ indata_error:
s5p_sg_done(dev);
dev->busy = false;
spin_unlock_irqrestore(&dev->lock, flags);
- s5p_aes_complete(dev, err);
+ s5p_aes_complete(req, err);
}
static void s5p_tasklet_cb(unsigned long data)