scripts/mod/modpost.c: fix memory leak

sec2annotation returns malloc'ed buffer directly to printf as an argument.
 Free this buffer after printing.

Signed-off-by: Alexey Fomenko <ext-alexey.fomenko@nokia.com>
Cc: Trevor Keith <tsrk@tsrk.net>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 40 insertions, 14 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index c827309c29c..1ce655dde99 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1245,6 +1245,8 @@ static void report_sec_mismatch(const char *modname,
 {
         const char *from, *from_p;
         const char *to, *to_p;
+        char *prl_from;
+        char *prl_to;
 
         switch (from_is_func) {
         case 0: from = "variable"; from_p = "";   break;
@@ -1268,16 +1270,21 @@ static void report_sec_mismatch(const char *modname,
 
         switch (mismatch->mismatch) {
         case TEXT_TO_ANY_INIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The function %s%s() references\n"
                 "the %s %s%s%s.\n"
                 "This is often because %s lacks a %s\n"
                 "annotation or the annotation of %s is wrong.\n",
-                sec2annotation(fromsec), fromsym,
-                to, sec2annotation(tosec), tosym, to_p,
-                fromsym, sec2annotation(tosec), tosym);
+                prl_from, fromsym,
+                to, prl_to, tosym, to_p,
+                fromsym, prl_to, tosym);
+                free(prl_from);
+                free(prl_to);
                 break;
         case DATA_TO_ANY_INIT: {
+                prl_to = sec2annotation(tosec);
                 const char *const *s = mismatch->symbol_white_list;
                 fprintf(stderr,
                 "The variable %s references\n"
@@ -1285,20 +1292,24 @@ static void report_sec_mismatch(const char *modname,
                 "If the reference is valid then annotate the\n"
                 "variable with __init* or __refdata (see linux/init.h) "
                 "or name the variable:\n",
-                fromsym, to, sec2annotation(tosec), tosym, to_p);
+                fromsym, to, prl_to, tosym, to_p);
                 while (*s)
                         fprintf(stderr, "%s, ", *s++);
                 fprintf(stderr, "\n");
+                free(prl_to);
                 break;
         }
         case TEXT_TO_ANY_EXIT:
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The function %s() references a %s in an exit section.\n"
                 "Often the %s %s%s has valid usage outside the exit section\n"
                 "and the fix is to remove the %sannotation of %s.\n",
-                fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
+                fromsym, to, to, tosym, to_p, prl_to, tosym);
+                free(prl_to);
                 break;
         case DATA_TO_ANY_EXIT: {
+                prl_to = sec2annotation(tosec);
                 const char *const *s = mismatch->symbol_white_list;
                 fprintf(stderr,
                 "The variable %s references\n"
@@ -1306,24 +1317,31 @@ static void report_sec_mismatch(const char *modname,
                 "If the reference is valid then annotate the\n"
                 "variable with __exit* (see linux/init.h) or "
                 "name the variable:\n",
-                fromsym, to, sec2annotation(tosec), tosym, to_p);
+                fromsym, to, prl_to, tosym, to_p);
                 while (*s)
                         fprintf(stderr, "%s, ", *s++);
                 fprintf(stderr, "\n");
+                free(prl_to);
                 break;
         }
         case XXXINIT_TO_SOME_INIT:
         case XXXEXIT_TO_SOME_EXIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The %s %s%s%s references\n"
                 "a %s %s%s%s.\n"
                 "If %s is only used by %s then\n"
                 "annotate %s with a matching annotation.\n",
-                from, sec2annotation(fromsec), fromsym, from_p,
-                to, sec2annotation(tosec), tosym, to_p,
+                from, prl_from, fromsym, from_p,
+                to, prl_to, tosym, to_p,
                 tosym, fromsym, tosym);
+                free(prl_from);
+                free(prl_to);
                 break;
         case ANY_INIT_TO_ANY_EXIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The %s %s%s%s references\n"
                 "a %s %s%s%s.\n"
@@ -1332,11 +1350,15 @@ static void report_sec_mismatch(const char *modname,
                 "uses functionality in the exit path.\n"
                 "The fix is often to remove the %sannotation of\n"
                 "%s%s so it may be used outside an exit section.\n",
-                from, sec2annotation(fromsec), fromsym, from_p,
-                to, sec2annotation(tosec), tosym, to_p,
+                from, prl_from, fromsym, from_p,
+                to, prl_to, tosym, to_p,
                 sec2annotation(tosec), tosym, to_p);
+                free(prl_from);
+                free(prl_to);
                 break;
         case ANY_EXIT_TO_ANY_INIT:
+                prl_from = sec2annotation(fromsec);
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The %s %s%s%s references\n"
                 "a %s %s%s%s.\n"
@@ -1345,16 +1367,20 @@ static void report_sec_mismatch(const char *modname,
                 "uses functionality in the init path.\n"
                 "The fix is often to remove the %sannotation of\n"
                 "%s%s so it may be used outside an init section.\n",
-                from, sec2annotation(fromsec), fromsym, from_p,
-                to, sec2annotation(tosec), tosym, to_p,
-                sec2annotation(tosec), tosym, to_p);
+                from, prl_from, fromsym, from_p,
+                to, prl_to, tosym, to_p,
+                prl_to, tosym, to_p);
+                free(prl_from);
+                free(prl_to);
                 break;
         case EXPORT_TO_INIT_EXIT:
+                prl_to = sec2annotation(tosec);
                 fprintf(stderr,
                 "The symbol %s is exported and annotated %s\n"
                 "Fix this by removing the %sannotation of %s "
                 "or drop the export.\n",
-                tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
+                tosym, prl_to, prl_to, tosym);
+                free(prl_to);
                 break;
         }
         fprintf(stderr, "\n");