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Date: Thu, 26 Apr 2007 20:45:10 +1000 From: Rusty Russell <rusty@...tcorp.com.au> To: Andrew Morton <akpm@...ux-foundation.org> Cc: lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>, virtualization <virtualization@...ts.linux-foundation.org> Subject: [PATCH] Fix lguest oops when guest dies while receiving I/O lguest needs to hold a reference to its task in case it exits while another Guest is sending it I/O. Otherwise we can oops in access_process_vm->get_task_mm->task_lock(). Signed-off-by: Rusty Russell <rusty@...tcorp.com.au> --- drivers/lguest/lguest_user.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) =================================================================== --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -107,7 +107,8 @@ static int initialize(struct file *file, setup_regs(lg->regs, args[2]); setup_guest_gdt(lg); lg->tsk = current; - lg->mm = get_task_mm(current); + get_task_struct(lg->tsk); + lg->mm = get_task_mm(lg->tsk); lg->last_pages = NULL; mutex_unlock(&lguest_lock); @@ -160,6 +161,7 @@ static int close(struct inode *inode, st mutex_lock(&lguest_lock); release_all_dma(lg); free_guest_pagetable(lg); + put_task_struct(lg->tsk); mmput(lg->mm); if (!IS_ERR(lg->dead)) kfree(lg->dead); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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