[dpdk-dev] [PATCH] cryptodev: fix supported size check

[Pablo de Lara]

Crypto capability structure contains supported
sizes for key, IV, digest, etc. on different algorithms.
These sizes can be expressed as a single value or
a range of values.
The check was broken when a size was checked against
a range with multiple values.

Also, for more clarity, the param_range_check macro
has been converted into a function.

Fixes: 38227c0e3ad2 ("cryptodev: retrieve device info")
Cc: stable at dpdk.org

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
---
 lib/librte_cryptodev/rte_cryptodev.c | 45 ++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 12 deletions(-)

diff --git a/lib/librte_cryptodev/rte_cryptodev.c b/lib/librte_cryptodev/rte_cryptodev.c
index 2a95a351f..4959f2ae6 100644
--- a/lib/librte_cryptodev/rte_cryptodev.c
+++ b/lib/librte_cryptodev/rte_cryptodev.c
@@ -262,19 +262,40 @@ rte_cryptodev_sym_capability_get(uint8_t dev_id,
 
 }
 
-#define param_range_check(x, y) \
-	(((x < y.min) || (x > y.max)) || \
-	(y.increment != 0 && (x % y.increment) != 0))
+static int
+param_range_check(uint16_t size, const struct rte_crypto_param_range *range)
+{
+	unsigned int next_size;
+
+	/* Check lower/upper bounds */
+	if (size < range->min)
+		return -1;
+
+	if (size > range->max)
+		return -1;
+
+	/* If range is actually only one value, size is correct */
+	if (range->increment == 0)
+		return 0;
+
+	/* Check if value is one of the supported sizes */
+	for (next_size = range->min; next_size <= range->max;
+			next_size += range->increment)
+		if (size == next_size)
+			return 0;
+
+	return -1;
+}
 
 int
 rte_cryptodev_sym_capability_check_cipher(
 		const struct rte_cryptodev_symmetric_capability *capability,
 		uint16_t key_size, uint16_t iv_size)
 {
-	if (param_range_check(key_size, capability->cipher.key_size))
+	if (param_range_check(key_size, &capability->cipher.key_size) != 0)
 		return -1;
 
-	if (param_range_check(iv_size, capability->cipher.iv_size))
+	if (param_range_check(iv_size, &capability->cipher.iv_size) != 0)
 		return -1;
 
 	return 0;
@@ -285,13 +306,13 @@ rte_cryptodev_sym_capability_check_auth(
 		const struct rte_cryptodev_symmetric_capability *capability,
 		uint16_t key_size, uint16_t digest_size, uint16_t iv_size)
 {
-	if (param_range_check(key_size, capability->auth.key_size))
+	if (param_range_check(key_size, &capability->auth.key_size) != 0)
 		return -1;
 
-	if (param_range_check(digest_size, capability->auth.digest_size))
+	if (param_range_check(digest_size, &capability->auth.digest_size) != 0)
 		return -1;
 
-	if (param_range_check(iv_size, capability->auth.iv_size))
+	if (param_range_check(iv_size, &capability->auth.iv_size) != 0)
 		return -1;
 
 	return 0;
@@ -303,16 +324,16 @@ rte_cryptodev_sym_capability_check_aead(
 		uint16_t key_size, uint16_t digest_size, uint16_t aad_size,
 		uint16_t iv_size)
 {
-	if (param_range_check(key_size, capability->aead.key_size))
+	if (param_range_check(key_size, &capability->aead.key_size) != 0)
 		return -1;
 
-	if (param_range_check(digest_size, capability->aead.digest_size))
+	if (param_range_check(digest_size, &capability->aead.digest_size) != 0)
 		return -1;
 
-	if (param_range_check(aad_size, capability->aead.aad_size))
+	if (param_range_check(aad_size, &capability->aead.aad_size) != 0)
 		return -1;
 
-	if (param_range_check(iv_size, capability->aead.iv_size))
+	if (param_range_check(iv_size, &capability->aead.iv_size) != 0)
 		return -1;
 
 	return 0;
-- 
2.17.0