diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2018-12-19 12:29:13 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-02 17:24:45 +0200 |
| commit | add40f8f1a84d7c8feb76e8ab7f197a5b0627bd8 (patch) | |
| tree | 049485e3d25dfec2638b457c069a8c10bcc2aa00 /fs/ext4/namei.c | |
| parent | 331999a770bb5e75b5dab906a9f6aad680bb0959 (diff) | |
ext4: avoid declaring fs inconsistent due to invalid file handles
commit 8a363970d1dc38c4ec4ad575c862f776f468d057 upstream.
If we receive a file handle, either from NFS or open_by_handle_at(2),
and it points at an inode which has not been initialized, and the file
system has metadata checksums enabled, we shouldn't try to get the
inode, discover the checksum is invalid, and then declare the file
system as being inconsistent.
This can be reproduced by creating a test file system via "mke2fs -t
ext4 -O metadata_csum /tmp/foo.img 8M", mounting it, cd'ing into that
directory, and then running the following program.
#define _GNU_SOURCE
#include <fcntl.h>
struct handle {
struct file_handle fh;
unsigned char fid[MAX_HANDLE_SZ];
};
int main(int argc, char **argv)
{
struct handle h = {{8, 1 }, { 12, }};
open_by_handle_at(AT_FDCWD, &h.fh, O_RDONLY);
return 0;
}
Google-Bug-Id: 120690101
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Ashwin H <ashwinh@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ext4/namei.c')
| -rw-r--r-- | fs/ext4/namei.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 3f7b3836166c..161099f39ab9 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1597,7 +1597,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi dentry); return ERR_PTR(-EFSCORRUPTED); } - inode = ext4_iget_normal(dir->i_sb, ino); + inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL); if (inode == ERR_PTR(-ESTALE)) { EXT4_ERROR_INODE(dir, "deleted inode referenced: %u", @@ -1639,7 +1639,7 @@ struct dentry *ext4_get_parent(struct dentry *child) return ERR_PTR(-EFSCORRUPTED); } - return d_obtain_alias(ext4_iget_normal(child->d_sb, ino)); + return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL)); } /* |