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Change History

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

xen/privcmd: fix error exit of privcmd_ioctl_dm_op()

The error exit of privcmd_ioctl_dm_op() is calling unlock_pages()
potentially with pages being NULL, leading to a NULL dereference.

Additionally lock_pages() doesn't check for pin_user_pages_fast()
having been completely successful, resulting in potentially not
locking all pages into memory. This could result in sporadic failures
when using the related memory in user mode.

Fix all of that by calling unlock_pages() always with the real number
of pinned pages, which will be zero in case pages being NULL, and by
checking the number of pages pinned by pin_user_pages_fast() matching
the expected number of pages.

https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6

https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef

https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a

https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54