lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1446623914-9367-1-git-send-email-yalin.wang2010@gmail.com>
Date:	Wed,  4 Nov 2015 15:58:34 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	tytso@....edu, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	yalin wang <yalin.wang2010@...il.com>
Subject: [RFC] ext4: fix a BUG in ext4_mpage_readpages()

The last block should be the total read pages last block,
need adjust the block number when caculate every page.

Signed-off-by: yalin wang <yalin.wang2010@...il.com>
---
 fs/ext4/readpage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index 5dc5e95..d20c39d 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -174,7 +174,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
 			goto confused;
 
 		block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
-		last_block = block_in_file + nr_pages * blocks_per_page;
+		last_block = block_in_file + (nr_pages - page_idx) * blocks_per_page;
 		last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits;
 		if (last_block > last_block_in_file)
 			last_block = last_block_in_file;
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ