Fix: lttng: free sessions in cmd_destroy

When doing `lttng destroy`, I get:

    Direct leak of 4385 byte(s) in 1 object(s) allocated from:
        #0 0x7f74ae025459 in __interceptor_calloc /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:154
        #1 0x7f74add4129a in zmalloc /home/simark/src/lttng-tools/src/common/macros.h:45
        #2 0x7f74add42b9d in recv_sessiond_optional_data /home/simark/src/lttng-tools/src/lib/lttng-ctl/lttng-ctl.c:494
        #3 0x7f74add42f9a in lttng_ctl_ask_sessiond_fds_varlen /home/simark/src/lttng-tools/src/lib/lttng-ctl/lttng-ctl.c:596
        #4 0x7f74add41714 in lttng_ctl_ask_sessiond_varlen_no_cmd_header /home/simark/src/lttng-tools/src/lib/lttng-ctl/lttng-ctl-helper.h:58
        #5 0x7f74add41747 in lttng_ctl_ask_sessiond /home/simark/src/lttng-tools/src/lib/lttng-ctl/lttng-ctl-helper.h:78
        #6 0x7f74add4a922 in lttng_list_sessions /home/simark/src/lttng-tools/src/lib/lttng-ctl/lttng-ctl.c:2105
        #7 0x56472bcbdf80 in cmd_destroy /home/simark/src/lttng-tools/src/bin/lttng/commands/destroy.c:330
        #8 0x56472bd00764 in handle_command /home/simark/src/lttng-tools/src/bin/lttng/lttng.c:237
        #9 0x56472bd01218 in parse_args /home/simark/src/lttng-tools/src/bin/lttng/lttng.c:426
        #10 0x56472bd0151a in main /home/simark/src/lttng-tools/src/bin/lttng/lttng.c:475
        #11 0x7f74ad963b24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)

This is due to cmd_destroy not free'ing the result of
lttng_list_sessions. Fix that.

Change-Id: Iff2e75e6ec1cdcd0bdfdbbc3d5099422e592905b
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bin/lttng/commands/destroy.c b/src/bin/lttng/commands/destroy.c
index 2e473f519f3c52924eb7f3c40ac30b8ff8870ab0..398646f2e65183e5ce77d34eaec60dad3d006f3b 100644 (file)
--- a/src/bin/lttng/commands/destroy.c
+++ b/src/bin/lttng/commands/destroy.c
@@ -272,7 +272,7 @@ int cmd_destroy(int argc, const char **argv)
        char *session_name = NULL;
        const char *leftover = NULL;
 
-       struct lttng_session *sessions;
+       struct lttng_session *sessions = NULL;
        int count;
        int found;
 
@@ -423,6 +423,8 @@ end:
                free(session_name);
        }
 
+       free(sessions);
+
        /* Overwrite ret if an error occurred during destroy_session/all */
        ret = command_ret ? command_ret : ret;