kbuild: fix segv in modpost

Parsing an old Modules.symvers file casued modpost to SEGV.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 0dd16177642d..65411665e13c 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -205,6 +205,8 @@ static const char *export_str(enum export ex)
 static enum export export_no(const char * s)
 {
         int i;
+        if (!s)
+                return export_unknown;
         for (i = 0; export_list[i].export != export_unknown; i++) {
                 if (strcmp(export_list[i].str, s) == 0)
                         return export_list[i].export;
@@ -1271,7 +1273,7 @@ static void write_if_changed(struct buffer *b, const char *fname)
 }
 
 /* parse Module.symvers file. line format:
- * 0x12345678<tab>symbol<tab>module[<tab>export]
+ * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
  **/
 static void read_dump(const char *fname, unsigned int kernel)
 {
@@ -1284,7 +1286,7 @@ static void read_dump(const char *fname, unsigned int kernel)
                 return;
 
         while ((line = get_next_line(&pos, file, size))) {
-                char *symname, *modname, *d, *export;
+                char *symname, *modname, *d, *export, *end;
                 unsigned int crc;
                 struct module *mod;
                 struct symbol *s;
@@ -1297,7 +1299,8 @@ static void read_dump(const char *fname, unsigned int kernel)
                 *modname++ = '\0';
                 if ((export = strchr(modname, '\t')) != NULL)
                         *export++ = '\0';
-
+                if (export && ((end = strchr(export, '\t')) != NULL))
+                        *end = '\0';
                 crc = strtoul(line, &d, 16);
                 if (*symname == '\0' || *modname == '\0' || *d != '\0')
                         goto fail;