crypto: sun8i-ce-cipher - fix error handling in sun8i_ce_cipher_prepare()

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

crypto: sun8i-ce-cipher - fix error handling in sun8i_ce_cipher_prepare()

Fix two DMA cleanup issues on the error path in sun8i_ce_cipher_prepare():

1] If dma_map_sg() fails for areq->dst, the device driver would try to free

DMA memory it has not allocated in the first place. To fix this, on the

"theend_sgs" error path, call dma unmap only if the corresponding dma

map was successful.

2] If the dma_map_single() call for the IV fails, the device driver would

try to free an invalid DMA memory address on the "theend_iv" path:

------------[ cut here ]------------

DMA-API: sun8i-ce 1904000.crypto: device driver tries to free an invalid DMA memory address

WARNING: CPU: 2 PID: 69 at kernel/dma/debug.c:968 check_unmap+0x123c/0x1b90

Modules linked in: skcipher_example(O+)

CPU: 2 UID: 0 PID: 69 Comm: 1904000.crypto- Tainted: G O 6.15.0-rc3+ #24 PREEMPT

Tainted: [O]=OOT_MODULE

Hardware name: OrangePi Zero2 (DT)

pc : check_unmap+0x123c/0x1b90

lr : check_unmap+0x123c/0x1b90

...

Call trace:

check_unmap+0x123c/0x1b90 (P)

debug_dma_unmap_page+0xac/0xc0

dma_unmap_page_attrs+0x1f4/0x5fc

sun8i_ce_cipher_do_one+0x1bd4/0x1f40

crypto_pump_work+0x334/0x6e0

kthread_worker_fn+0x21c/0x438

kthread+0x374/0x664

ret_from_fork+0x10/0x20

---[ end trace 0000000000000000 ]---

To fix this, check for !dma_mapping_error() before calling

dma_unmap_single() on the "theend_iv" path.