btrfs: Handle uninitialised inode eviction

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The code flow in btrfs_new_inode allows for btrfs_evict_inode to be
called with not fully initialised inode (e.g. ->root member not
being set). This can happen when btrfs_set_inode_index in
btrfs_new_inode fails, which in turn would call iput for the newly
allocated inode. This in turn leads to vfs calling into btrfs_evict_inode.
This leads to null pointer dereference. To handle this situation check whether
the passed inode has root set and just free it in case it doesn't.

Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Nikolay Borisov 2016-06-29 09:46:41 +03:00 • committed by David Sterba

parent fb770ae414

commit 3d48d9810d

1 changed files with 8 additions and 1 deletions

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fs/btrfs/inode.c

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