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Re: [PATCH v2 2.6.38-rc8-tip 7/20] 7: uprobes: store/restore original instruction.
- From: Stephen Wilson <wilsons at start dot ca>
- To: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- Cc: Peter Zijlstra <peterz at infradead dot org>, Ingo Molnar <mingo at elte dot hu>, Steven Rostedt <rostedt at goodmis dot org>, Linux-mm <linux-mm at kvack dot org>, Arnaldo Carvalho de Melo <acme at infradead dot org>, Linus Torvalds <torvalds at linux-foundation dot org>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Christoph Hellwig <hch at infradead dot org>, Andi Kleen <andi at firstfloor dot org>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, Oleg Nesterov <oleg at redhat dot com>, LKML <linux-kernel at vger dot kernel dot org>, Jim Keniston <jkenisto at linux dot vnet dot ibm dot com>, Roland McGrath <roland at hack dot frob dot com>, SystemTap <systemtap at sources dot redhat dot com>, Andrew Morton <akpm at linux-foundation dot org>, "Paul E. McKenney" <paulmck at linux dot vnet dot ibm dot com>
- Date: Mon, 14 Mar 2011 14:09:14 -0400
- Subject: Re: [PATCH v2 2.6.38-rc8-tip 7/20] 7: uprobes: store/restore original instruction.
- References: <20110314133403.27435.7901.sendpatchset@localhost6.localdomain6> <20110314133522.27435.45121.sendpatchset@localhost6.localdomain6>
On Mon, Mar 14, 2011 at 07:05:22PM +0530, Srikar Dronamraju wrote:
> static int install_uprobe(struct mm_struct *mm, struct uprobe *uprobe)
> {
> - int ret = 0;
> + struct task_struct *tsk;
> + int ret = -EINVAL;
>
> - /*TODO: install breakpoint */
> - if (!ret)
> + get_task_struct(mm->owner);
> + tsk = mm->owner;
> + if (!tsk)
> + return ret;
I think you need to check that tsk != NULL before calling
get_task_struct()...
> static int remove_uprobe(struct mm_struct *mm, struct uprobe *uprobe)
> {
> - int ret = 0;
> + struct task_struct *tsk;
> + int ret;
> +
> + get_task_struct(mm->owner);
> + tsk = mm->owner;
> + if (!tsk)
> + return -EINVAL;
And here as well.
--
steve