diff options
| author | Eneas U de Queiroz <cotequeiroz@gmail.com> | 2020-02-07 16:02:25 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-02-13 10:05:26 +0100 |
| commit | d6364b8128439a8c0e381f80c38667de9f15eef8 (patch) | |
| tree | 921782c8c63eb6c52b430c247906f03e1923bf3f /drivers/crypto/qce/dma.c | |
| parent | crypto: allwinner - remove redundant platform_get_irq error message (diff) | |
| download | linux-d6364b8128439a8c0e381f80c38667de9f15eef8.tar.xz linux-d6364b8128439a8c0e381f80c38667de9f15eef8.zip | |
crypto: qce - use cryptlen when adding extra sgl
The qce crypto driver appends an extra entry to the dst sgl, to maintain
private state information.
When the gcm driver sends requests to the ctr skcipher, it passes the
authentication tag after the actual crypto payload, but it must not be
touched.
Commit 1336c2221bee ("crypto: qce - save a sg table slot for result
buf") limited the destination sgl to avoid overwriting the
authentication tag but it assumed the tag would be in a separate sgl
entry.
This is not always the case, so it is better to limit the length of the
destination buffer to req->cryptlen before appending the result buf.
Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/qce/dma.c')
| -rw-r--r-- | drivers/crypto/qce/dma.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/crypto/qce/dma.c b/drivers/crypto/qce/dma.c index 7da893dc00e7..46db5bf366b4 100644 --- a/drivers/crypto/qce/dma.c +++ b/drivers/crypto/qce/dma.c @@ -48,9 +48,10 @@ void qce_dma_release(struct qce_dma_data *dma) struct scatterlist * qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl, - int max_ents) + unsigned int max_len) { struct scatterlist *sg = sgt->sgl, *sg_last = NULL; + unsigned int new_len; while (sg) { if (!sg_page(sg)) @@ -61,13 +62,13 @@ qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl, if (!sg) return ERR_PTR(-EINVAL); - while (new_sgl && sg && max_ents) { - sg_set_page(sg, sg_page(new_sgl), new_sgl->length, - new_sgl->offset); + while (new_sgl && sg && max_len) { + new_len = new_sgl->length > max_len ? max_len : new_sgl->length; + sg_set_page(sg, sg_page(new_sgl), new_len, new_sgl->offset); sg_last = sg; sg = sg_next(sg); new_sgl = sg_next(new_sgl); - max_ents--; + max_len -= new_len; } return sg_last; |