linux-kernel - [PATCH 5.8 108/118] s390/zcrypt: fix kmalloc 256k failure

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Date:   Mon, 21 Sep 2020 18:28:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Ingo Franzki <ifranzki@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: [PATCH 5.8 108/118] s390/zcrypt: fix kmalloc 256k failure

From: Harald Freudenberger <freude@...ux.ibm.com>

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@...ux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@...ux.ibm.com>
Cc: Stable <stable@...r.kernel.org>
Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/s390/crypto/zcrypt_ccamisc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/s390/crypto/zcrypt_ccamisc.c
+++ b/drivers/s390/crypto/zcrypt_ccamisc.c
@@ -1685,9 +1685,9 @@ int cca_findcard2(u32 **apqns, u32 *nr_a
 	*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);
@@ -1755,7 +1755,7 @@ int cca_findcard2(u32 **apqns, u32 *nr_a
 		verify = 0;
 	}
 
-	kfree(device_status);
+	kvfree(device_status);
 	return rc;
 }
 EXPORT_SYMBOL(cca_findcard2);