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

[Baruch Siach <baruch@tkos.co.il>]

Hi Fabrice,

On Sun, Feb 17 2019, Fabrice Fontaine wrote:
> Fixes:
>  - http://autobuild.buildroot.org/results/a56c515746874549714270c9a635f8a2ef303e67
>
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@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@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@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.

> +
> +     buffer = ssh_buffer_new();
> +     if (buffer == NULL) {

baruch

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