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crypto: chelsio - This fixes the kernel panic which occurs during a libkcapi test 

The libkcapi test which causes kernel panic is
aead asynchronous vmsplice multiple test.

./bin/kcapi  -v -d 4 -x 10   -c "ccm(aes)"
-q 4edb58e8d5eb6bc711c43a6f3693daebde2e5524f1b55297abb29f003236e43d
-t a7877c99 -n 674742abd0f5ba -k 2861fd0253705d7875c95ba8a53171b4
-a fb7bc304a3909e66e2e0c5ef952712dd884ce3e7324171369f2c5db1adc48c7d

This patch avoids dma_mapping of a zero length sg which causes the panic,
by using sg_nents_for_len which maps only upto a specific length

Signed-off-by: Ayush Sawal <ayush.sawal@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
alistair/sensors
Ayush Sawal 2020-02-05 10:48:42 +05:30 committed by Herbert Xu
parent 1c502e2e2d
commit 9195189e00
1 changed files with 3 additions and 2 deletions
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5
drivers/crypto/chelsio/chcr_algo.c
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@ -2489,8 +2489,9 @@ int chcr_aead_dma_map(struct device *dev,
else
reqctx->b0_dma = 0;
if (req->src == req->dst) {
error = dma_map_sg(dev, req->src, sg_nents(req->src),
DMA_BIDIRECTIONAL);
error = dma_map_sg(dev, req->src,
sg_nents_for_len(req->src, dst_size),
DMA_BIDIRECTIONAL);
if (!error)
goto err;
} else {