tree 7a0ccb3d6ee636dbd3267b01c3d69946ae718d6c
parent 2f27b5034244c4ebd70c90066defa771a99a5320
author Thomas Gleixner <tglx@linutronix.de> 1634136943 +0200
committer Borislav Petkov <bp@suse.de> 1634801561 +0200

x86/fpu: Do not leak fpstate pointer on fork

If fork fails early then the copied task struct would carry the fpstate
pointer of the parent task.

Not a problem right now, but later when dynamically allocated buffers
are available, keeping the pointer might result in freeing the
parent's buffer. Set it to NULL which prevents that. If fork reaches
clone_thread(), the pointer will be correctly set to the new task
context.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211013145322.817101108@linutronix.de