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| author |   Jan Kara <jack@suse.cz> | 2022-08-22 13:48:32 +0200 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2022-09-29 23:01:40 -0400 |
| commit | 61a1d87a324ad5e3ed27c6699dfc93218fcf3201 (patch) | |
| tree | 9023d9cdc8222778859141d2a750c6d7d652376b | |
| parent | fs/buffer: make submit_bh & submit_bh_wbc return type as void (diff) | |
| download | linux-dev-61a1d87a324ad5e3ed27c6699dfc93218fcf3201.tar.xz linux-dev-61a1d87a324ad5e3ed27c6699dfc93218fcf3201.zip | |
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
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Link: https://lore.kernel.org/r/20220822114832.1482-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/namei.c | 2 |
1 files changed, 1 insertions, 1 deletions
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); |