Fedor Pchelkin 88f3869649 s390/pkey: Prevent overflow in size calculation for memdup_user() ... commit 7360ee4759 upstream. Number of apqn target list entries contained in 'nr_apqns' variable is determined by userspace via an ioctl call so the result of the product in calculation of size passed to memdup_user() may overflow. In this case the actual size of the allocated area and the value describing it won't be in sync leading to various types of unpredictable behaviour later. Use a proper memdup_array_user() helper which returns an error if an overflow is detected. Note that it is different from when nr_apqns is initially zero - that case is considered valid and should be handled in subsequent pkey_handler implementations. Found by Linux Verification Center (linuxtesting.org). Fixes: f2bbc96e7c ("s390/pkey: add CCA AES cipher key support") Cc: stable@vger.kernel.org Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru> Reviewed-by: Holger Dengler <dengler@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Link: https://lore.kernel.org/r/20250611192011.206057-1-pchelkin@ispras.ru Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-07-06 11:00:11 +02:00
..
block	Revert "s390/dasd: Establish DMA alignment"	2024-08-29 17:33:59 +02:00
char	s390/tty: Fix a potential memory leak bug	2025-05-02 07:50:53 +02:00
cio	s390/cio: Fix CHPID "configure" attribute caching	2025-03-22 12:50:42 -07:00
crypto	s390/pkey: Prevent overflow in size calculation for memdup_user()	2025-07-06 11:00:11 +02:00
net	s390/ism: add release function for struct device	2025-02-27 04:10:48 -08:00
scsi	scsi: s390: zfcp: Ensure synchronous unit_add	2025-06-27 11:08:59 +01:00
virtio	s390/airq: remove lsi_mask from airq_struct	2023-08-30 11:03:28 +02:00
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