[dpdk-dev] [PATCH] lib/cryptodev: fix driver name comparison

[Anoob Joseph]

The string compare to the length of driver name might give false
positives when there are drivers with similar names (one being the
subset of another).

Following is such a naming which could result in false positive.
1. crypto_driver
2. crypto_driver1

When strncmp with len = strlen("crypto_driver") is done, it could give
a false positive when compared against "crypto_driver1".

Fixes: d11b0f30df88 ("cryptodev: introduce API and framework for crypto devices")

Signed-off-by: Ankur Dwivedi <adwivedi at marvell.com>
Signed-off-by: Anoob Joseph <anoobj at marvell.com>
---
 lib/librte_cryptodev/rte_cryptodev.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lib/librte_cryptodev/rte_cryptodev.c b/lib/librte_cryptodev/rte_cryptodev.c
index 7009735..b743c60 100644
--- a/lib/librte_cryptodev/rte_cryptodev.c
+++ b/lib/librte_cryptodev/rte_cryptodev.c
@@ -510,7 +510,8 @@ rte_cryptodev_pmd_get_named_dev(const char *name)
 		dev = &cryptodev_globals.devs[i];
 
 		if ((dev->attached == RTE_CRYPTODEV_ATTACHED) &&
-				(strcmp(dev->data->name, name) == 0))
+				(strncmp(dev->data->name, name,
+					 RTE_CRYPTODEV_NAME_MAX_LEN) == 0))
 			return dev;
 	}
 
@@ -542,8 +543,8 @@ rte_cryptodev_get_dev_id(const char *name)
 		return -1;
 
 	for (i = 0; i < cryptodev_globals.nb_devs; i++)
-		if ((strcmp(cryptodev_globals.devs[i].data->name, name)
-				== 0) &&
+		if ((strncmp(cryptodev_globals.devs[i].data->name, name,
+				RTE_CRYPTODEV_NAME_MAX_LEN) == 0) &&
 				(cryptodev_globals.devs[i].attached ==
 						RTE_CRYPTODEV_ATTACHED))
 			return i;
@@ -586,7 +587,7 @@ rte_cryptodev_devices_get(const char *driver_name, uint8_t *devices,
 
 			cmp = strncmp(devs[i].device->driver->name,
 					driver_name,
-					strlen(driver_name));
+					RTE_CRYPTODEV_NAME_MAX_LEN);
 
 			if (cmp == 0)
 				devices[count++] = devs[i].data->dev_id;
@@ -1691,7 +1692,7 @@ rte_cryptodev_driver_id_get(const char *name)
 
 	TAILQ_FOREACH(driver, &cryptodev_driver_list, next) {
 		driver_name = driver->driver->name;
-		if (strncmp(driver_name, name, strlen(driver_name)) == 0)
+		if (strncmp(driver_name, name, RTE_CRYPTODEV_NAME_MAX_LEN) == 0)
 			return driver->id;
 	}
 	return -1;
-- 
2.7.4