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  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 22 Aug 2022 13:48:32 +0200
From:   Jan Kara <>
To:     Ted Tso <>
Cc:     <>, Lukas Czerner <>,
        Salvatore Bonaccorso <>,
        Jan Kara <>,
Subject: [PATCH] ext4: Fix check for block being out of directory size

The check in __ext4_read_dirblock() for block being outside of directory
size was wrong because it compared block number against directory size
in bytes. Fix it.

Fixes: 65f8ea4cd57d ("ext4: check if directory block is within i_size")
CVE: CVE-2022-1184
Signed-off-by: Jan Kara <>
 fs/ext4/namei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 3a31b662f661..bc2e0612ec32 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -126,7 +126,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
 	struct ext4_dir_entry *dirent;
 	int is_dx_block = 0;
-	if (block >= inode->i_size) {
+	if (block >= inode->i_size >> inode->i_blkbits) {
 		ext4_error_inode(inode, func, line, block,
 		       "Attempting to read directory block (%u) that is past i_size (%llu)",
 		       block, inode->i_size);

Powered by blists - more mailing lists