[PATCH] eal: check string parameter lengths

[Anatoly Burakov <anatoly.burakov@intel.com>]

When specifying parameters such as hugefile prefix from the
command-line, it is possibly to supply an empty string. This may
lead to various problems: for example, if hugefile prefix is
empty, the runtime config path construction may end up
looking like "/var/run/dpdk//_config", which will technically
work, but is wrong and places files in the wrong place.

To fix it, check lengths of such user-specified parameters for
hugefile prefix, as well as hugepage dir and user-specified
mbuf pool ops string.

Cc: stable@dpdk.org

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/common/eal_common_options.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 3796dbf48..02de3b73e 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -1408,6 +1408,21 @@ eal_check_common_options(struct internal_config *internal_cfg)
 		RTE_LOG(ERR, EAL, "Invalid process type specified\n");
 		return -1;
 	}
+	if (internal_cfg->hugefile_prefix != NULL &&
+			strlen(internal_cfg->hugefile_prefix) < 1) {
+		RTE_LOG(ERR, EAL, "Invalid length of --" OPT_FILE_PREFIX " option\n");
+		return -1;
+	}
+	if (internal_cfg->hugepage_dir != NULL &&
+			strlen(internal_cfg->hugepage_dir) < 1) {
+		RTE_LOG(ERR, EAL, "Invalid length of --" OPT_HUGE_DIR" option\n");
+		return -1;
+	}
+	if (internal_cfg->user_mbuf_pool_ops_name != NULL &&
+			strlen(internal_cfg->user_mbuf_pool_ops_name) < 1) {
+		RTE_LOG(ERR, EAL, "Invalid length of --" OPT_MBUF_POOL_OPS_NAME" option\n");
+		return -1;
+	}
 	if (index(eal_get_hugefile_prefix(), '%') != NULL) {
 		RTE_LOG(ERR, EAL, "Invalid char, '%%', in --"OPT_FILE_PREFIX" "
 			"option\n");
-- 
2.17.1