RDMA/ucma: Fix use-after-free access in ucma_close

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commit ed65a4dc22 upstream.

The error in ucma_create_id() left ctx in the list of contexts belong
to ucma file descriptor. The attempt to close this file descriptor causes
to use-after-free accesses while iterating over such list.

Fixes: 7521663857 ("RDMA/cma: Export rdma cm interface to userspace")
Reported-by: <syzbot+dcfd344365a56fbebd0f@syzkaller.appspotmail.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Leon Romanovsky 2018-03-19 14:20:15 +02:00 • committed by Greg Kroah-Hartman

parent 123f9f8981

commit ac89535557

1 changed files with 3 additions and 0 deletions

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drivers/infiniband/core/ucma.c

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