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s390/3270: Fix buffer assignment

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Since commit 1b2ac5a6d61f ("s390/3270: use new address translation
helpers") rq->buffer is passed unconditionally to virt_to_dma32().
The 3270 driver allocates requests without buffer, so the value passed
to virt_to_dma32 might be NULL. Check for NULL before assigning.

Fixes: 1b2ac5a6d61f ("s390/3270: use new address translation helpers")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-04-23 07:57:49 +02:00 committed by Alexander Gordeev
parent 412050af2e
commit 5e1a99cf22
1 changed files with 4 additions and 2 deletions
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6
drivers/s390/char/raw3270.c
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@ -162,7 +162,8 @@ struct raw3270_request *raw3270_request_alloc(size_t size)
/*
* Setup ccw.
*/
rq->ccw.cda = virt_to_dma32(rq->buffer);
if (rq->buffer)
rq->ccw.cda = virt_to_dma32(rq->buffer);
rq->ccw.flags = CCW_FLAG_SLI;
return rq;
@ -188,7 +189,8 @@ int raw3270_request_reset(struct raw3270_request *rq)
return -EBUSY;
rq->ccw.cmd_code = 0;
rq->ccw.count = 0;
rq->ccw.cda = virt_to_dma32(rq->buffer);
if (rq->buffer)
rq->ccw.cda = virt_to_dma32(rq->buffer);
rq->ccw.flags = CCW_FLAG_SLI;
rq->rescnt = 0;
rq->rc = 0;