CVE-2022-50564

published 2025-10-22

CVE-2022-50564: In the Linux kernel, the following vulnerability has been resolved: s390/netiucv: Fix return type of netiucv_tx() With clang's kernel control flow integrity…

Priority P4 21

In the Linux kernel, the following vulnerability has been resolved:

s390/netiucv: Fix return type of netiucv_tx()

With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),
indirect call targets are validated against the expected function
pointer prototype to make sure the call target is valid to help mitigate
ROP attacks. If they are not identical, there is a failure at run time,
which manifests as either a kernel panic or thread getting killed. A
proposed warning in clang aims to catch these at compile time, which
reveals:

drivers/s390/net/netiucv.c:1854:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict]
.ndo_start_xmit = netiucv_tx,
^~~~~~~~~~

->ndo_start_xmit() in 'struct net_device_ops' expects a return type of
'netdev_tx_t', not 'int'. Adjust the return type of netiucv_tx() to
match the prototype's to resolve the warning and potential CFI failure,
should s390 select ARCH_SUPPORTS_CFI_CLANG in the future.

Additionally, while in the area, remove a comment block that is no
longer relevant.

Affected

23 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.4-1 (bookworm)	linux 6.1.4-1 (bookworm)
linux	linux	—	—
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < f13d870fce90f01cf930bfaffecc8185ae0be21c	f13d870fce90f01cf930bfaffecc8185ae0be21c
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < eccc88c0efe407e579291792ad07a7dedc0f63f0	eccc88c0efe407e579291792ad07a7dedc0f63f0
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < 85d392710275355425df8618ccbebbc336f5acc5	85d392710275355425df8618ccbebbc336f5acc5
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < 4bee3c75d5bf7c2b5dc0b520410eb40449e5da31	4bee3c75d5bf7c2b5dc0b520410eb40449e5da31
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < 3ac0217ca9186c2f9af9a0113a331a42aa847894	3ac0217ca9186c2f9af9a0113a331a42aa847894
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < dfbf0122ea1b9b3e73fa22c8ff6bd888935c54fc	dfbf0122ea1b9b3e73fa22c8ff6bd888935c54fc
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < e7a849f740e3576e79cba403697e916f4c3a6f12	e7a849f740e3576e79cba403697e916f4c3a6f12
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < d034fa43af92fc46a81d882f46d9cc3e4ffdbbcc	d034fa43af92fc46a81d882f46d9cc3e4ffdbbcc
linux	linux	>= dc1f8bf68b311b1537cb65893430b6796118498a < 88d86d18d7cf7e9137c95f9d212bb9fff8a1b4be	88d86d18d7cf7e9137c95f9d212bb9fff8a1b4be
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 2.6.32 < 4.9.337	4.9.337
linux	linux_kernel	>= 4.10.0 < 4.14.303	4.14.303
linux	linux_kernel	>= 4.15.0 < 4.19.270	4.19.270
linux	linux_kernel	>= 4.20.0 < 5.4.229	5.4.229
linux	linux_kernel	>= 5.11.0 < 5.15.86	5.15.86
linux	linux_kernel	>= 5.16.0 < 6.0.16	6.0.16
linux	linux_kernel	>= 5.5.0 < 5.10.163	5.10.163
linux	linux_kernel	>= 6.1.0 < 6.1.2	6.1.2

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