From: Oleg Drokin <green@linuxhacker.ru>
Date: Wed, 23 Nov 2005 21:37:47 +0000 (-0800)
Subject: [PATCH] 32bit integer overflow in invalidate_inode_pages2()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=479ef592f3664dd629417098c8599261c0f689ab;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] 32bit integer overflow in invalidate_inode_pages2()

Fix a 32 bit integer overflow in invalidate_inode_pages2_range.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/truncate.c b/mm/truncate.c
index 29c18f68dc35..9173ab500604 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -282,8 +282,8 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 					 * Zap the rest of the file in one hit.
 					 */
 					unmap_mapping_range(mapping,
-					    page_index << PAGE_CACHE_SHIFT,
-					    (end - page_index + 1)
+					   (loff_t)page_index<<PAGE_CACHE_SHIFT,
+					   (loff_t)(end - page_index + 1)
 							<< PAGE_CACHE_SHIFT,
 					    0);
 					did_range_unmap = 1;
@@ -292,7 +292,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 					 * Just zap this page
 					 */
 					unmap_mapping_range(mapping,
-					  page_index << PAGE_CACHE_SHIFT,
+					  (loff_t)page_index<<PAGE_CACHE_SHIFT,
 					  PAGE_CACHE_SIZE, 0);
 				}
 			}