[dpdk-dev] [PATCH 5/6] eal: fix log level regexp matching

[Olivier Matz <olivier.matz@6wind.com>]

Fix misuse of regular expression functions, which was producing a
segfault.

After the patch, it works properly:

  $ ./build/app/test --no-huge --log-level=pmd,3
  RTE>>dump_log_types
  [...]
  id 30: user7, level is debug
  id 31: user8, level is debug
  id 32: pmd.i40e.init, level is critical
  id 33: pmd.i40e.driver, level is critical

Fixes: a5279180f510 ("eal: change several log levels matching a regexp")
Coverity issue: 143472

Reported-by: Jianfeng Tan <jianfeng.tan@intel.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 lib/librte_eal/common/eal_common_log.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/eal_common_log.c b/lib/librte_eal/common/eal_common_log.c
index 7d13cc026..c2957d167 100644
--- a/lib/librte_eal/common/eal_common_log.c
+++ b/lib/librte_eal/common/eal_common_log.c
@@ -159,10 +159,14 @@ rte_log_set_level_regexp(const char *pattern, uint32_t level)
 	if (level > RTE_LOG_DEBUG)
 		return -1;
 
+	if (regcomp(&r, pattern, 0) != 0)
+		return -1;
+
 	for (i = 0; i < rte_logs.dynamic_types_len; i++) {
 		if (rte_logs.dynamic_types[i].name == NULL)
 			continue;
-		if (regexec(&r, pattern, 0, NULL, 0) == 0)
+		if (regexec(&r, rte_logs.dynamic_types[i].name, 0,
+				NULL, 0) == 0)
 			rte_logs.dynamic_types[i].loglevel = level;
 	}
 
-- 
2.11.0