diff options
| -rw-r--r-- | mm/nommu.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 298884dcd6e7..1898b2fe9da5 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -282,6 +282,10 @@ EXPORT_SYMBOL(vmalloc_to_pfn); long vread(char *buf, char *addr, unsigned long count) { + /* Don't allow overflow */ + if ((unsigned long) buf + count < count) + count = -(unsigned long) buf; + memcpy(buf, addr, count); return count; } |