s390/zcrypt: Fix CPRB memory allocation in zcrypt misc code

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Both CPRB alloc functions in zcrypt_ccamisc.c and zcrypt_ep11misc.c
did not round up the memory allocation to a multiple of 4 bytes as it
is needed by the zcrypt layer to process the CPRBs.

Now the alloc_and_prep_cprbmem() and alloc_cprbmem() functions
guarantee that the base CPRB struct and a possible parameter block are
aligned to a 4-byte boundary and the backing memory allocation is
rounded up to the next multiple of 4 byte. Also the free_cprbmem() is
updated and scrubs the rounded up amount of memory.

Fixes: 9bdb5f7e83 ("s390/zcrypt: Introduce cprb mempool for cca misc functions")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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This commit is contained in:

Harald Freudenberger 2026-08-03 10:33:34 +02:00 • committed by Vasily Gorbik

parent 01476391ae

commit 5004889551

2 changed files with 25 additions and 11 deletions

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20

drivers/s390/crypto/zcrypt_ccamisc.c

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16

drivers/s390/crypto/zcrypt_ep11misc.c

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