kernel/linux.git/drivers/s390, branch v5.15.209

Revert "s390/cio: Fix device lifecycle handling in css_alloc_subchannel()"

2026-06-01T15:35:46+00:00

This reverts commit b1d4e6fb241672850296956c4d782a69363a3807. Signed-off-by: Sasha Levin

s390/cio: Fix device lifecycle handling in css_alloc_subchannel()

2026-03-04T12:19:23+00:00

[ Upstream commit f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 ] `css_alloc_subchannel()` calls `device_initialize()` before setting up the DMA masks. If `dma_set_coherent_mask()` or `dma_set_mask()` fails, the error path frees the subchannel structure directly, bypassing the device model reference counting. Once `device_initialize()` has been called, the embedded struct device must be released via `put_device()`, allowing the release callback to free the container structure. Fix the error path by dropping the initial device reference with `put_device()` instead of calling `kfree()` directly. This ensures correct device lifetime handling and avoids potential use-after-free or double-free issues. Fixes: e5dcf0025d7af ("s390/css: move subchannel lock allocation") Signed-off-by: Salah Triki Reviewed-by: Vineeth Vijayan Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin

s390/ap: Don't leak debug feature files if AP instructions are not available

2026-01-19T12:09:24+00:00

[ Upstream commit 020d5dc57874e58d3ebae398f3fe258f029e3d06 ] If no AP instructions are available the AP bus module leaks registered debug feature files. Change function call order to fix this. Fixes: cccd85bfb7bf ("s390/zcrypt: Rework debug feature invocations.") Reviewed-by: Harald Freudenberger Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin

s390/ctcm: Fix double-kfree

2025-12-06T21:09:31+00:00

[ Upstream commit da02a1824884d6c84c5e5b5ac373b0c9e3288ec2 ] The function 'mpc_rcvd_sweep_req(mpcginfo)' is called conditionally from function 'ctcmpc_unpack_skb'. It frees passed mpcginfo. After that a call to function 'kfree' in function 'ctcmpc_unpack_skb' frees it again. Remove 'kfree' call in function 'mpc_rcvd_sweep_req(mpcginfo)'. Bug detected by the clang static analyzer. Fixes: 0c0b20587b9f25a2 ("s390/ctcm: fix potential memory leak") Reviewed-by: Aswin Karuvally Signed-off-by: Aleksei Nikiforov Signed-off-by: Aswin Karuvally Reviewed-by: Simon Horman Link: https://patch.msgid.link/20251112182724.1109474-1-aswin@linux.ibm.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

s390/cio: Update purge function to unregister the unused subchannels

2025-10-29T13:03:13+00:00

commit 9daa5a8795865f9a3c93d8d1066785b07ded6073 upstream. Starting with 'commit 2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers")', cio no longer unregisters subchannels when the attached device is invalid or unavailable. As an unintended side-effect, the cio_ignore purge function no longer removes subchannels for devices on the cio_ignore list if no CCW device is attached. This situation occurs when a CCW device is non-operational or unavailable To ensure the same outcome of the purge function as when the current cio_ignore list had been active during boot, update the purge function to remove I/O subchannels without working CCW devices if the associated device number is found on the cio_ignore list. Fixes: 2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers") Suggested-by: Peter Oberparleiter Reviewed-by: Peter Oberparleiter Signed-off-by: Vineeth Vijayan Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman

s390/cio: unregister the subchannel while purging

2025-10-19T14:21:41+00:00

[ Upstream commit fa172f043f5bc21c357c54a6ca2e9c8acd18c3db ] The cio_ignore list is used to create and maintain the list of devices which is to be ignored by Linux. During boot-time, this list is adjusted and accommodate all the devices which are configured on the HMC interface. Once these devices are accessible, they are then available to Linux and set online. cio_ignore purge function should align with this functionality. But currently, the subchannel associated with the offline-devices are not unregistered during purge. Add an explicit subchannel-unregister function in the purge_fn callback. Signed-off-by: Vineeth Vijayan Reviewed-by: Peter Oberparleiter Signed-off-by: Vasily Gorbik Stable-dep-of: 9daa5a879586 ("s390/cio: Update purge function to unregister the unused subchannels") Signed-off-by: Sasha Levin

s390/pkey: Prevent overflow in size calculation for memdup_user()

2025-07-10T13:57:37+00:00

commit 7360ee47599af91a1d5f4e74d635d9408a54e489 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: f2bbc96e7cfa ("s390/pkey: add CCA AES cipher key support") Cc: stable@vger.kernel.org Signed-off-by: Fedor Pchelkin Reviewed-by: Holger Dengler Reviewed-by: Heiko Carstens Link: https://lore.kernel.org/r/20250611192011.206057-1-pchelkin@ispras.ru Signed-off-by: Alexander Gordeev Signed-off-by: Greg Kroah-Hartman

scsi: s390: zfcp: Ensure synchronous unit_add

2025-06-27T10:05:34+00:00

commit 9697ca0d53e3db357be26d2414276143c4a2cd49 upstream. Improve the usability of the unit_add sysfs attribute by ensuring that the associated FCP LUN scan processing is completed synchronously. This enables configuration tooling to consistently determine the end of the scan process to allow for serialization of follow-on actions. While the scan process associated with unit_add typically completes synchronously, it is deferred to an asynchronous background process if unit_add is used before initial remote port scanning has completed. This occurs when unit_add is used immediately after setting the associated FCP device online. To ensure synchronous unit_add processing, wait for remote port scanning to complete before initiating the FCP LUN scan. Cc: stable@vger.kernel.org Reviewed-by: M Nikhil Reviewed-by: Nihar Panda Signed-off-by: Peter Oberparleiter Signed-off-by: Nihar Panda Link: https://lore.kernel.org/r/20250603182252.2287285-2-niharp@linux.ibm.com Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman

s390/tty: Fix a potential memory leak bug

2025-05-02T05:44:34+00:00

[ Upstream commit ad9bb8f049717d64c5e62b2a44954be9f681c65b ] The check for get_zeroed_page() leads to a direct return and overlooked the memory leak caused by loop allocation. Add a free helper to free spaces allocated by get_zeroed_page(). Signed-off-by: Haoxiang Li Acked-by: Heiko Carstens Link: https://lore.kernel.org/r/20250218034104.2436469-1-haoxiang_li2024@163.com Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin

s390/sclp: Add check for get_zeroed_page()

2025-05-02T05:44:34+00:00

[ Upstream commit 3db42c75a921854a99db0a2775814fef97415bac ] Add check for the return value of get_zeroed_page() in sclp_console_init() to prevent null pointer dereference. Furthermore, to solve the memory leak caused by the loop allocation, add a free helper to do the free job. Signed-off-by: Haoxiang Li Acked-by: Heiko Carstens Link: https://lore.kernel.org/r/20250218025216.2421548-1-haoxiang_li2024@163.com Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin