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.

Fixes: 06f751b61329 ("crypto: allwinner - Add sun8i-ce Crypto Engine")
Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

0 files changed, 0 insertions, 0 deletions