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authorDarrick J. Wong <djwong@us.ibm.com>2009-10-14 16:21:00 -0700
committerMarcelo Tosatti <mtosatti@redhat.com>2009-10-16 12:30:26 -0300
commit0ea4ed8e948c30f88c824c973ee4b9529015fe65 (patch)
treeb7bbcbc50fda3290c3acbb6ca38bd1e4dd3f05c6 /drivers
parent8a8365c560b8b631e0a2d1ac032fbca66a9645bc (diff)
KVM: Prevent kvm_init from corrupting debugfs structures
I'm seeing an oops condition when kvm-intel and kvm-amd are modprobe'd during boot (say on an Intel system) and then rmmod'd: # modprobe kvm-intel kvm_init() kvm_init_debug() kvm_arch_init() <-- stores debugfs dentries internally (success, etc) # modprobe kvm-amd kvm_init() kvm_init_debug() <-- second initialization clobbers kvm's internal pointers to dentries kvm_arch_init() kvm_exit_debug() <-- and frees them # rmmod kvm-intel kvm_exit() kvm_exit_debug() <-- double free of debugfs files! *BOOM* If execution gets to the end of kvm_init(), then the calling module has been established as the kvm provider. Move the debugfs initialization to the end of the function, and remove the now-unnecessary call to kvm_exit_debug() from the error path. That way we avoid trampling on the debugfs entries and freeing them twice. Cc: stable@kernel.org Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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