Description

In the Linux kernel, the following vulnerability has been resolved: net: wwan: iosm: fix NULL pointer dereference when removing device In suspend and resume cycle, the removal and rescan of device ends up in NULL pointer dereference. During driver initialization, if the ipc_imem_wwan_channel_init() fails to get the valid device capabilities it returns an error and further no resource (wwan struct) will be allocated. Now in this situation if driver removal procedure is initiated it would result in NULL pointer exception since unallocated wwan struct is dereferenced inside ipc_wwan_deinit(). ipc_imem_run_state_worker() to handle the called functions return value and to release the resource in failure case. It also reports the link down event in failure cases. The user space application can handle this event to do a device reset for restoring the device communication.

Weaknesses 1

Affected Products 4

References 3

• git.kernel.org https://git.kernel.org/stable/c/60829145f1e2650b31ebe6a0ec70a9725b38fa2c
  Patch
• git.kernel.org https://git.kernel.org/stable/c/862c6e3e26735247d8a4df41fa2421909c3f4d63
  Patch
• git.kernel.org https://git.kernel.org/stable/c/ee44bacf462db3ec6e4f0dcfa7931e768670d77c
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/60829145f1e2650b31ebe6a0ec70a9725b38fa2c
  Patch
• git.kernel.org https://git.kernel.org/stable/c/862c6e3e26735247d8a4df41fa2421909c3f4d63
  Patch
• git.kernel.org https://git.kernel.org/stable/c/ee44bacf462db3ec6e4f0dcfa7931e768670d77c
  Patch