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linux/fs/fuse/inode.c
Miklos Szeredi 84dd9744f4 fuse: Fix oops at process_init_reply() 
commit e8f3bd773d upstream.

syzbot is hitting NULL pointer dereference at process_init_reply().
This is because deactivate_locked_super() is called before response for
initial request is processed.

Fix this by aborting and waiting for all requests (including FUSE_INIT)
before resetting fc->sb.

Original patch by Tetsuo Handa <penguin-kernel@I-love.SKAURA.ne.jp>.

Reported-by: syzbot <syzbot+b62f08f4d5857755e3bc@syzkaller.appspotmail.com>
Fixes: e27c9d3877 ("fuse: fuse: add time_gran to INIT_OUT")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
[bwh: Backported to 3.16:
 - Drop second argument to fuse_abort_conn()
 - fuse_wait_aborted() is not needed]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
2018-12-16 22:08:26 +00:00

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