diff options
| -rw-r--r-- | include/linux/highmem.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 0b5d89621cb9..44170f312ae7 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -283,6 +283,7 @@ static inline void memcpy_page(struct page *dst_page, size_t dst_off, char *dst = kmap_local_page(dst_page); char *src = kmap_local_page(src_page); + VM_BUG_ON(dst_off + len > PAGE_SIZE || src_off + len > PAGE_SIZE); memcpy(dst + dst_off, src + src_off, len); kunmap_local(src); kunmap_local(dst); @@ -295,6 +296,7 @@ static inline void memmove_page(struct page *dst_page, size_t dst_off, char *dst = kmap_local_page(dst_page); char *src = kmap_local_page(src_page); + VM_BUG_ON(dst_off + len > PAGE_SIZE || src_off + len > PAGE_SIZE); memmove(dst + dst_off, src + src_off, len); kunmap_local(src); kunmap_local(dst); @@ -305,6 +307,7 @@ static inline void memset_page(struct page *page, size_t offset, int val, { char *addr = kmap_local_page(page); + VM_BUG_ON(offset + len > PAGE_SIZE); memset(addr + offset, val, len); kunmap_local(addr); } @@ -314,6 +317,7 @@ static inline void memcpy_from_page(char *to, struct page *page, { char *from = kmap_local_page(page); + VM_BUG_ON(offset + len > PAGE_SIZE); memcpy(to, from + offset, len); kunmap_local(from); } @@ -323,6 +327,7 @@ static inline void memcpy_to_page(struct page *page, size_t offset, { char *to = kmap_local_page(page); + VM_BUG_ON(offset + len > PAGE_SIZE); memcpy(to + offset, from, len); kunmap_local(to); } |