crypto: caam - Clamp AEAD SG list by input length
Currently caam assumes that the SG list contains exactly the number
of bytes required. This assumption is incorrect.
Up until now this has been harmless. However with the new AEAD
interface this now breaks as the AD SG list contains more bytes
than just the AD.
This patch fixes this by always clamping the AD SG list by the
specified AD length.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h
index 3b91821..efbc1db 100644
--- a/drivers/crypto/caam/sg_sw_sec4.h
+++ b/drivers/crypto/caam/sg_sw_sec4.h
@@ -55,6 +55,21 @@
sec4_sg_ptr->len |= SEC4_SG_LEN_FIN;
}
+static inline struct sec4_sg_entry *sg_to_sec4_sg_len(
+ struct scatterlist *sg, unsigned int total,
+ struct sec4_sg_entry *sec4_sg_ptr)
+{
+ do {
+ unsigned int len = min(sg_dma_len(sg), total);
+
+ dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0);
+ sec4_sg_ptr++;
+ sg = sg_next(sg);
+ total -= len;
+ } while (total);
+ return sec4_sg_ptr - 1;
+}
+
/* count number of elements in scatterlist */
static inline int __sg_count(struct scatterlist *sg_list, int nbytes,
bool *chained)