[BUG] readline history
Alexander Aring
alex.aring at gmail.com
Mon Sep 1 01:44:57 PDT 2014
Hi Sascha,
On Mon, Sep 01, 2014 at 10:30:33AM +0200, Sascha Hauer wrote:
> Hi Teresa,
>
> On Thu, Aug 28, 2014 at 09:50:05AM +0200, Teresa Gamez wrote:
> > Hello Sascha,
> >
> > I noticed a bug on the latest master.
> > When no history is present and I hit the arrow up key, I get:
> >
> > unable to handle NULL pointer dereference at address 0x00000001
> > pc : [<9fe243ba>] lr : [<9fe268cf>]
> > sp : 9ffff9d0 ip : 00000016 fp : 00000002
> > r10: 00000001 r9 : 9fe549dc r8 : 9fe65d08
> > r7 : 00000400 r6 : 00000001 r5 : 00000000 r4 : 9fe66258
> > r3 : 00000000 r2 : 00000000 r1 : 00000001 r0 : 9fe66258
> > Flags: nZCv IRQs off FIQs on Mode SVC_32
> > [<9fe243ba>] (strcpy+0xa/0xe) from [<9fe268cf>] (readline+0x363/0x4e0)
> > [<9fe268cf>] (readline+0x363/0x4e0) from [<9fe05469>] (file_get
> > +0x49/0x110)
> >
> > I could bisect it to this commit:
> >
> >
> > ada160a34a1ec8421d5bb7b9dd746294668a5130 is the first bad commit
> > commit ada160a34a1ec8421d5bb7b9dd746294668a5130
> > Author: Sascha Hauer <s.hauer at pengutronix.de>
> > Date: Tue Jul 29 11:54:26 2014 +0200
>
> Damned. While working on that patch I had exactly this problem and
> thought I tested this case. Apparantly I didn't :(
>
> The following should fix this:
>
> Sascha
>
> From 7fd0d972f71610c25276ca387164b1fd71fb74be Mon Sep 17 00:00:00 2001
> From: Sascha Hauer <s.hauer at pengutronix.de>
> Date: Mon, 1 Sep 2014 10:21:44 +0200
> Subject: [PATCH] readline: Fix history prev when history is empty
>
> We cannot use list_entry() on an empty list. Without history
> we have to return an empty line. This fixes a crash when the
> cursor up button is pressed and no command has been entered
> previously. Broken since:
>
> commit ada160a34a1ec8421d5bb7b9dd746294668a5130
> Author: Sascha Hauer <s.hauer at pengutronix.de>
> Date: Tue Jul 29 11:54:26 2014 +0200
>
> readline: reimplement history functions
>
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> Reported-by: Teresa Gamez <t.gamez at phytec.de>
> ---
> lib/readline.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/lib/readline.c b/lib/readline.c
> index b70bca8..e855abd 100644
> --- a/lib/readline.c
> +++ b/lib/readline.c
> @@ -68,6 +68,9 @@ static const char *hist_prev(void)
> struct history *history;
>
> if (history_current->prev == &history_list) {
> + if (list_empty(&history_list))
> + return "";
> +
what's about to ring the terminal bell when this happen?
- Alex
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