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drivers/base/memory: set mem->altmap after successful device registration

In the Linux kernel, the following vulnerability has been resolved: drivers/base/memory: set mem->altmap after successful device registration If __add_memory_block() fails at xa_store() (under memory pressure for example), device_unregister() is called, which eventually triggers memory_block_release() with mem->altmap still set, causing a WARN_ON(mem->altmap). This was triggered by modifying virtio-mem driver. Fix this by delaying the assignment of mem->altmap until after __add_memory_block() has succeeded.

Affected products

Linux
  • <059ac6252a63edf1cea79bf30bd860a8c264b62c
  • =<6.18.*
  • <22dc0d042f02ce82aa61422ea5f232628bfd9e9c
  • <802e113cf120df7208e4c7e604950a85e87120a8
  • =<7.0.*
  • <bc3dd82a0ffd488bb902f4c69c3d28fd4088d973
  • =<6.12.*
  • <6c25bf4e44a2b6a14332f952bba0974521f5b72d
  • =<7.1.*
  • <a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a
  • =<*
  • =<6.6.*
  • <6.6
  • ==6.6