Port: Explicitly allocate realpath() resolved buffer

[lttng-tools.git] / src / common / utils.c

diff --git a/src/common/utils.c b/src/common/utils.c
index 11018739be9ad9c7e6a83340a2434fdc2fc654c1..2417a7d255ffb1445e12ec9e24ba2b5a29900e1d 100644 (file)
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -36,6 +36,7 @@
 #include <common/compat/getenv.h>
 #include <common/compat/string.h>
 #include <common/compat/dirent.h>
+#include <lttng/constant.h>
 
 #include "utils.h"
 #include "defaults.h"
@@ -81,6 +82,8 @@ char *utils_partial_realpath(const char *path, char *resolved_path, size_t size)
 
        /* Resolve the canonical path of the first part of the path */
        while (try_path != NULL && next != end) {
+               char *try_path_buf = NULL;
+
                /*
                 * If there is not any '/' left, we want to try with
                 * the full path
@@ -97,9 +100,16 @@ char *utils_partial_realpath(const char *path, char *resolved_path, size_t size)
                        goto error;
                }
 
+               try_path_buf = zmalloc(LTTNG_PATH_MAX);
+               if (!try_path_buf) {
+                       PERROR("zmalloc");
+                       goto error;
+               }
+
                /* Try to resolve this part */
-               try_path = realpath((char *)cut_path, NULL);
+               try_path = realpath((char *)cut_path, try_path_buf);
                if (try_path == NULL) {
+                       free(try_path_buf);
                        /*
                         * There was an error, we just want to be assured it
                         * is linked to an unexistent directory, if it's another
@@ -116,6 +126,7 @@ char *utils_partial_realpath(const char *path, char *resolved_path, size_t size)
                        }
                } else {
                        /* Save the place we are before trying the next step */
+                       try_path_buf = NULL;
                        free(try_path_prev);
                        try_path_prev = try_path;
                        prev = next;