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https://github.com/torvalds/linux
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cb78d1b5ef
The recent patch to make afs_getattr consult the server didn't account
for the pseudo-inodes employed by the dynamic root-type afs superblock
not having a volume or a server to access, and thus an oops occurs if
such a directory is stat'd.
Fix this by checking to see if the vnode->volume pointer actually points
anywhere before following it in afs_getattr().
This can be tested by stat'ing a directory in /afs. It may be
sufficient just to do "ls /afs" and the oops looks something like:
BUG: kernel NULL pointer dereference, address: 0000000000000020
...
RIP: 0010:afs_getattr+0x8b/0x14b
...
Call Trace:
<TASK>
vfs_statx+0x79/0xf5
vfs_fstatat+0x49/0x62
Fixes:
|
||
|---|---|---|
| .. | ||
| addr_list.c | ||
| afs.h | ||
| afs_cm.h | ||
| afs_fs.h | ||
| afs_vl.h | ||
| callback.c | ||
| cell.c | ||
| cmservice.c | ||
| dir.c | ||
| dir_edit.c | ||
| dir_silly.c | ||
| dynroot.c | ||
| file.c | ||
| flock.c | ||
| fs_operation.c | ||
| fs_probe.c | ||
| fsclient.c | ||
| inode.c | ||
| internal.h | ||
| Kconfig | ||
| main.c | ||
| Makefile | ||
| misc.c | ||
| mntpt.c | ||
| proc.c | ||
| protocol_afs.h | ||
| protocol_uae.h | ||
| protocol_yfs.h | ||
| rotate.c | ||
| rxrpc.c | ||
| security.c | ||
| server.c | ||
| server_list.c | ||
| super.c | ||
| vl_alias.c | ||
| vl_list.c | ||
| vl_probe.c | ||
| vl_rotate.c | ||
| vlclient.c | ||
| volume.c | ||
| write.c | ||
| xattr.c | ||
| xdr_fs.h | ||
| yfsclient.c | ||