log: fix log level regexp matching

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

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

Reported-by: Jianfeng Tan <jianfeng.tan@intel.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/lib/librte_eal/common/eal_common_log.c b/lib/librte_eal/common/eal_common_log.c
index fcc28a9..5f38ca5 100644 (file)
--- 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;
        }