[Buildroot] [PATCH 1/1] package/libssh: fix build with gcc 4.8

[Fabrice Fontaine]

Dear Baruch,
Le dim. 17 févr. 2019 à 20:26, Baruch Siach <baruch at tkos.co.il> a écrit :
>
> Hi Fabrice,
>
> On Sun, Feb 17 2019, Fabrice Fontaine wrote:
> > Fixes:
> >  - http://autobuild.buildroot.org/results/a56c515746874549714270c9a635f8a2ef303e67
> >
> > Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> > ---
> >  ...pt-fix-strict-overflow-error-with-gcc-4.8.patch | 34 ++++++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> >  create mode 100644 package/libssh/0005-pki_gcrypt-fix-strict-overflow-error-with-gcc-4.8.patch
> >
> > diff --git a/package/libssh/0005-pki_gcrypt-fix-strict-overflow-error-with-gcc-4.8.patch b/package/libssh/0005-pki_gcrypt-fix-strict-overflow-error-with-gcc-4.8.patch
> > new file mode 100644
> > index 0000000000..9187a612e7
> > --- /dev/null
> > +++ b/package/libssh/0005-pki_gcrypt-fix-strict-overflow-error-with-gcc-4.8.patch
> > @@ -0,0 +1,34 @@
> > +From aaebb96688cfcb9dc32fcfbb80a499cf2de25536 Mon Sep 17 00:00:00 2001
> > +From: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> > +Date: Sun, 17 Feb 2019 12:20:45 +0100
> > +Subject: [PATCH] pki_gcrypt: fix strict-overflow error with gcc 4.8
> > +
> > +/home/buildroot/autobuild/instance-1/output/build/libssh-0.8.6/src/pki_gcrypt.c: In function 'privatekey_string_to_buffer':
> > +/home/buildroot/autobuild/instance-1/output/build/libssh-0.8.6/src/pki_gcrypt.c:485:10: error: assuming signed overflow does not occur when simplifying conditional to constant [-Werror=strict-overflow]
> > +     while(len > 0 && strncmp(p, header_end, header_end_size) != 0) {
> > +          ^
> > +Fixes:
> > + - http://autobuild.buildroot.org/results/a56c515746874549714270c9a635f8a2ef303e67
> > +
> > +Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> > +[Upstream status: https://bugs.libssh.org/T132]
> > +---
> > + src/pki_gcrypt.c | 2 +-
> > + 1 file changed, 1 insertion(+), 1 deletion(-)
> > +
> > +diff --git a/src/pki_gcrypt.c b/src/pki_gcrypt.c
> > +index c0cf5926..e7b26fe6 100644
> > +--- a/src/pki_gcrypt.c
> > ++++ b/src/pki_gcrypt.c
> > +@@ -409,7 +409,7 @@ static ssh_buffer privatekey_string_to_buffer(const char *pkey, int type,
> > +     unsigned int iv_len = 0;
> > +     int algo = 0;
> > +     int mode = 0;
> > +-    int len;
> > ++    size_t len;
>
> I don't think you can do that. size_t is unsigned. len is passed to the
> get_next_line() macro that does this:
>
>         if(p[len] == '\0')    /* EOL */    \
>             len = -1;
>
> Callers of get_next_line() rely on this behavior.
Indeed, you're right, I was too quick on this one :-/. I'll send a new
patch to disable -Werror.
>
> > +
> > +     buffer = ssh_buffer_new();
> > +     if (buffer == NULL) {
>
> baruch
>
> --
>      http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>    - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -
Best Regards,

Fabrice