[dpdk-dev] [PATCH 4/5] examples: fix check for null before de-reference

Bruce Richardson bruce.richardson at intel.com
Tue Dec 16 16:03:52 CET 2014


The check for NULL is in the wrong position in the "if" error leg. The
pointer should be checked for NULL before checking what the value of
what the pointer points to is.

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 examples/vm_power_manager/channel_manager.c | 2 +-
 examples/vm_power_manager/vm_power_cli.c    | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/vm_power_manager/channel_manager.c b/examples/vm_power_manager/channel_manager.c
index 34a395d..04344ae 100644
--- a/examples/vm_power_manager/channel_manager.c
+++ b/examples/vm_power_manager/channel_manager.c
@@ -389,7 +389,7 @@ add_all_channels(const char *vm_name)
 		errno = 0;
 		channel_num = (unsigned)strtol(remaining, &tail_ptr, 0);
 		if ((errno != 0) || (remaining[0] == '\0') ||
-				(*tail_ptr != '\0') || tail_ptr == NULL) {
+				tail_ptr == NULL || (*tail_ptr != '\0')) {
 			RTE_LOG(WARNING, CHANNEL_MANAGER, "Malformed channel name"
 					"'%s' found it should be in the form of "
 					"'<guest_name>.<channel_num>(decimal)'\n",
diff --git a/examples/vm_power_manager/vm_power_cli.c b/examples/vm_power_manager/vm_power_cli.c
index e7f4469..bd685fd 100644
--- a/examples/vm_power_manager/vm_power_cli.c
+++ b/examples/vm_power_manager/vm_power_cli.c
@@ -323,7 +323,7 @@ cmd_channels_op_parsed(void *parsed_result, struct cmdline *cl,
 			break;
 		errno = 0;
 		channel_num = (unsigned)strtol(token, &tail_ptr, 10);
-		if ((errno != 0) || (*tail_ptr != '\0') || tail_ptr == NULL)
+		if ((errno != 0) || tail_ptr == NULL || (*tail_ptr != '\0'))
 			break;
 
 		if (channel_num == CHANNEL_CMDS_MAX_VM_CHANNELS) {
@@ -408,7 +408,7 @@ cmd_channels_status_op_parsed(void *parsed_result, struct cmdline *cl,
 			break;
 		errno = 0;
 		channel_num = (unsigned)strtol(token, &tail_ptr, 10);
-		if ((errno != 0) || (*tail_ptr != '\0') || tail_ptr == NULL)
+		if ((errno != 0) || tail_ptr == NULL || (*tail_ptr != '\0'))
 			break;
 
 		if (channel_num == CHANNEL_CMDS_MAX_VM_CHANNELS) {
-- 
1.9.3



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