korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2025-01-02 03:44:36 +08:00
Code Issues Packages Projects Releases Wiki Activity

x86/fpu: Do not leak fpstate pointer on fork

Browse Source 
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
This commit is contained in:
Thomas Gleixner 2021-10-13 16:55:43 +02:00 committed by Borislav Petkov
parent 2f27b50342
commit f0cbc8b3cd
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/process.c
View File

@ -87,6 +87,8 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
#ifdef CONFIG_VM86
dst->thread.vm86 = NULL;
#endif
/* Drop the copied pointer to current's fpstate */
dst->thread.fpu.fpstate = NULL;
return 0;
}