[U-Boot] [PATCH v2 1/3] dfu: Fix data abort in dfu_free_entities()

[Lukasz Majewski <lukma@denx.de>]

Hi Sam,

> On Fri, Jul 13, 2018 at 4:35 PM, Sam Protsenko
> <semen.protsenko@linaro.org> wrote:
> > Commit 5d8fae79163e ("dfu: avoid memory leak") brings a regression
> > which described below. This patch is effectively reverting that
> > commit, adding corresponding comment to avoid such regressions in
> > future.
> >
> > In case of error in dfu_config_entities(), it frees "dfu" array,
> > which leads to "data abort" in dfu_free_entities(), which tries to
> > free the same array (and even tries to access it from linked list
> > first). The issue occurs e.g. when partition table on device does
> > not match $dfu_alt_info layout:
> >  
> >     => dfu 0 mmc 1  
> >     Couldn't find part #2 on mmc device #1
> >     DFU entities configuration failed!
> >     data abort
> >
> > To fix this issue, do not free "dfu" array in
> > dfu_config_entities(). It will be freed later in
> > dfu_free_entities().
> >
> > Tested on BeagleBone Black (where this regression was originally
> > found).
> >
> > Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> > ---
> > Changes in v2:
> >   - Improve commit message by mentioning regression commit
> >  
> 
> Hi Lukasz,
> 
> Can you please review and merge this whole series?

This has been already included:

http://git.denx.de/?p=u-boot/u-boot-dfu.git;a=shortlog;h=refs/heads/master

Marek has fetch this tree and will send PR soon.

> 
> Thanks!
> 
> >  drivers/dfu/dfu.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
> > index e7c91193b9..a3c09334b7 100644
> > --- a/drivers/dfu/dfu.c
> > +++ b/drivers/dfu/dfu.c
> > @@ -462,7 +462,7 @@ int dfu_config_entities(char *env, char
> > *interface, char *devstr) ret = dfu_fill_entity(&dfu[i], s,
> > alt_num_cnt, interface, devstr);
> >                 if (ret) {
> > -                       free(dfu);
> > +                       /* We will free "dfu" in
> > dfu_free_entities() */ return -1;
> >                 }
> >
> > --
> > 2.18.0
> >  




Best regards,

Lukasz Majewski

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