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authorDavid Howells <dhowells@redhat.com>2020-06-19 00:01:28 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-20 12:01:58 -0700
commitf8ea5c7bceeb6ce6e7b3e7fb28c9dda8c0a58dcb (patch)
treefe81c5a5a3701fbf6ed946e3f10fe393d07b3782
parent4333a9b0b67bb4e8bcd91bdd80da80b0ec151162 (diff)
downloadlinux-sh-f8ea5c7bceeb6ce6e7b3e7fb28c9dda8c0a58dcb.tar.gz
afs: Fix afs_do_lookup() to call correct fetch-status op variant
Fix afs_do_lookup()'s fallback case for when FS.InlineBulkStatus isn't supported by the server. In the fallback, it calls FS.FetchStatus for the specific vnode it's meant to be looking up. Commit b6489a49f7b7 broke this by renaming one of the two identically-named afs_fetch_status_operation descriptors to something else so that one of them could be made non-static. The site that used the renamed one, however, wasn't renamed and didn't produce any warning because the other was declared in a header. Fix this by making afs_do_lookup() use the renamed variant. Note that there are two variants of the success method because one is called from ->lookup() where we may or may not have an inode, but can't call iget until after we've talked to the server - whereas the other is called from within iget where we have an inode, but it may or may not be initialised. The latter variant expects there to be an inode, but because it's being called from there former case, there might not be - resulting in an oops like the following: BUG: kernel NULL pointer dereference, address: 00000000000000b0 ... RIP: 0010:afs_fetch_status_success+0x27/0x7e ... Call Trace: afs_wait_for_operation+0xda/0x234 afs_do_lookup+0x2fe/0x3c1 afs_lookup+0x3c5/0x4bd __lookup_slow+0xcd/0x10f walk_component+0xa2/0x10c path_lookupat.isra.0+0x80/0x110 filename_lookup+0x81/0x104 vfs_statx+0x76/0x109 __do_sys_newlstat+0x39/0x6b do_syscall_64+0x4c/0x78 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: b6489a49f7b7 ("afs: Fix silly rename") Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/afs/dir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 3e3c2bf0a722..96757f3abd74 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -845,7 +845,7 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
* to FS.FetchStatus for op->file[1].
*/
op->fetch_status.which = 1;
- op->ops = &afs_fetch_status_operation;
+ op->ops = &afs_lookup_fetch_status_operation;
afs_begin_vnode_operation(op);
afs_wait_for_operation(op);
}