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s390/zcrypt: fix kmalloc 256k failure

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commit b6186d7fb53349efd274263a45f0b08749ccaa2d upstream.

Tests showed that under stress conditions the kernel may
temporary fail to allocate 256k with kmalloc. However,
this fix reworks the related code in the cca_findcard2()
function to use kvmalloc instead.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Harald Freudenberger 2020-09-09 11:59:43 +02:00 committed by Greg Kroah-Hartman
parent 463a0d4c1b
commit fceeea8b35
1 changed files with 4 additions and 4 deletions
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8
drivers/s390/crypto/zcrypt_ccamisc.c
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@ -1684,9 +1684,9 @@ int cca_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain,
*nr_apqns = 0;
/* fetch status of all crypto cards */
device_status = kmalloc_array(MAX_ZDEV_ENTRIES_EXT,
sizeof(struct zcrypt_device_status_ext),
GFP_KERNEL);
device_status = kvmalloc_array(MAX_ZDEV_ENTRIES_EXT,
sizeof(struct zcrypt_device_status_ext),
GFP_KERNEL);
if (!device_status)
return -ENOMEM;
zcrypt_device_status_mask_ext(device_status);
@ -1754,7 +1754,7 @@ int cca_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain,
verify = 0;
}
kfree(device_status);
kvfree(device_status);
return rc;
}
EXPORT_SYMBOL(cca_findcard2);