sound: oss/sb_audio: cap value in sb201_audio_set_speed()

[pandora-kernel.git] / kernel / module.c

diff --git a/kernel/module.c b/kernel/module.c
index 0e2da86..6085f5e 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2421,25 +2421,17 @@ static inline void kmemleak_load_module(const struct module *mod,
 
 #ifdef CONFIG_MODULE_SIG
 static int module_sig_check(struct load_info *info,
-                           const void *mod, unsigned long *len)
+                           const void *mod, unsigned long *_len)
 {
        int err = -ENOKEY;
-       const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
-       const void *p = mod, *end = mod + *len;
-
-       /* Poor man's memmem. */
-       while ((p = memchr(p, MODULE_SIG_STRING[0], end - p))) {
-               if (p + markerlen > end)
-                       break;
-
-               if (memcmp(p, MODULE_SIG_STRING, markerlen) == 0) {
-                       const void *sig = p + markerlen;
-                       /* Truncate module up to signature. */
-                       *len = p - mod;
-                       err = mod_verify_sig(mod, *len, sig, end - sig);
-                       break;
-               }
-               p++;
+       unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
+       unsigned long len = *_len;
+
+       if (len > markerlen &&
+           memcmp(mod + len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
+               /* We truncate the module to discard the signature */
+               *_len -= markerlen;
+               err = mod_verify_sig(mod, _len);
        }
 
        if (!err) {