1 files changed, 12 insertions, 10 deletions

diff --git a/scripts/basic/docproc.c b/scripts/basic/docproc.c
index dc7a0fcd2..ef5181226 100644
--- a/scripts/basic/docproc.c
+++ b/scripts/basic/docproc.c
@@ -79,7 +79,9 @@ void exec_kernel_doc(char **svec)
 {
         pid_t pid;
         int ret;
-        char real_filename[PATH_MAX + 1];
+        char *real_filename;
+        int rflen;
+
         /* Make sure output generated so far are flushed */
         fflush(stdout);
         switch(pid=fork()) {
@@ -87,10 +89,11 @@ void exec_kernel_doc(char **svec)
                         perror("fork");
                         exit(1);
                 case  0:
-                        memset(real_filename, 0, sizeof(real_filename));
-                        strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
-                        strncat(real_filename, KERNELDOCPATH KERNELDOC,
-                                        PATH_MAX - strlen(real_filename));
+                        rflen  = strlen(getenv("SRCTREE"));
+                        rflen += strlen(KERNELDOCPATH KERNELDOC);
+                        real_filename = alloca(rflen + 1);
+                        strcpy(real_filename, getenv("SRCTREE"));
+                        strcat(real_filename, KERNELDOCPATH KERNELDOC);
                         execvp(real_filename, svec);
                         fprintf(stderr, "exec ");
                         perror(real_filename);
@@ -166,11 +169,10 @@ void find_export_symbols(char * filename)
         struct symfile *sym;
         char line[MAXLINESZ];
         if (filename_exist(filename) == NULL) {
-                char real_filename[PATH_MAX + 1];
-                memset(real_filename, 0, sizeof(real_filename));
-                strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
-                strncat(real_filename, filename,
-                                PATH_MAX - strlen(real_filename));
+                int rflen = strlen(getenv("SRCTREE")) + strlen(filename);
+                char *real_filename = alloca(rflen + 1);
+                strcpy(real_filename, getenv("SRCTREE"));
+                strcat(real_filename, filename);
                 sym = add_new_file(filename);
                 fp = fopen(real_filename, "r");
                 if (fp == NULL)