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Change History

In the Linux kernel, the following vulnerability has been resolved:

accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()

Currently, if find_and_map_user_pages() takes a DMA xfer request from the
user with a length field set to 0, or in a rare case, the host receives
QAIC_TRANS_DMA_XFER_CONT from the device where resources->xferred_dma_size
is equal to the requested transaction size, the function will return 0
before allocating an sgt or setting the fields of the dma_xfer struct.
In that case, encode_addr_size_pairs() will try to access the sgt which
will lead to a general protection fault.

Return an EINVAL in case the user provides a zero-sized ALP, or the device
requests continuation after all of the bytes have been transferred.

https://git.kernel.org/stable/c/11f08c30a3e4157305ba692f1d44cca5fc9a8fca

https://git.kernel.org/stable/c/1ab9733d14cc9987cc5dcd1f0ad1f416e302e2e6

https://git.kernel.org/stable/c/48b1d42286bfef7628b1d6c8c28d4e456c90f725

https://git.kernel.org/stable/c/551f1dfbcb7f3e6ed07f9d6c8c1c64337fcd0ede