[PATCH 2/7] buffer: Promote to unsigned long long before shifting

On 32-bit systems, this shift will overflow for files larger than 4GB.

Cc: stable@vger.kernel.org Fixes: 5417169026c3 ("[FS] Implement block_page_mkwrite.") Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org --- fs/buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/buffer.c b/fs/buffer.c index 50bbc99e3d96..66f4765e60ee 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2515,7 +2515,7 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, }

/* page is wholly or partially inside EOF */ - if (((page->index + 1) << PAGE_SHIFT) > size) + if (((page->index + 1ULL) << PAGE_SHIFT) > size) end = size & ~PAGE_MASK; else end = PAGE_SIZE;