patches: Add backport/wireshark-Switch-to-tvb_bytes_to_str.patch

This is needed in order to build against Wireshark 3.6,
which was recently uploaded to sid.

debian/patches/backport/wireshark-Switch-to-tvb_bytes_to_str.patch

+From: Michal Privoznik <mprivozn@redhat.com>
+Date: Mon, 29 Nov 2021 09:57:49 +0100
+Subject: wireshark: Switch to tvb_bytes_to_str()
+
+When the dissector sees a byte sequence that is either an opaque
+data (xdr_opaque) or a byte sequence (xdr_bytes) it formats the
+bytes as a hex numbers using our own implementation. But
+wireshark already provides a function for it: tvb_bytes_to_str().
+NB, the reason why it returns a const string is so that callers
+don't try to free it - the string is allocated using an allocator
+which will decide when to free it.
+
+The wireshark formatter was introduced in wireshark commit of
+v1.99.2~479 and thus is present in the version we require at
+least (2.6.0).
+
+Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
+Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
+(cherry picked from commit 7e299ba649b1288d529c7595c0e6060c9ae0ff2a)
+---
+ tools/wireshark/src/packet-libvirt.c | 30 ++++++++----------------------
+ 1 file changed, 8 insertions(+), 22 deletions(-)
+
+diff --git a/tools/wireshark/src/packet-libvirt.c b/tools/wireshark/src/packet-libvirt.c
+index f43919b..cb922b8 100644
+--- a/tools/wireshark/src/packet-libvirt.c
++++ b/tools/wireshark/src/packet-libvirt.c
+@@ -158,24 +158,6 @@ dissect_xdr_string(tvbuff_t *tvb, proto_tree *tree, XDR *xdrs, int hf,
+     }
+ }
+ 
+-static const gchar *
+-format_xdr_bytes(guint8 *bytes, guint32 length)
+-{
+-    gchar *buf;
+-    guint32 i;
+-
+-    if (length == 0)
+-        return "";
+-    buf = wmem_alloc(wmem_packet_scope(), length*2 + 1);
+-    for (i = 0; i < length; i++) {
+-        /* We know that buf has enough size to contain
+-           2 * length + '\0' characters. */
+-        g_snprintf(buf, 2*(length - i) + 1, "%02x", bytes[i]);
+-        buf += 2;
+-    }
+-    return buf - length*2;
+-}
+-
+ static gboolean
+ dissect_xdr_opaque(tvbuff_t *tvb, proto_tree *tree, XDR *xdrs, int hf,
+                    guint32 size)
+@@ -187,8 +169,10 @@ dissect_xdr_opaque(tvbuff_t *tvb, proto_tree *tree, XDR *xdrs, int hf,
+     val = g_malloc(size);
+     start = xdr_getpos(xdrs);
+     if ((rc = xdr_opaque(xdrs, (caddr_t)val, size))) {
+-        proto_tree_add_bytes_format_value(tree, hf, tvb, start, xdr_getpos(xdrs) - start,
+-                                          NULL, "%s", format_xdr_bytes(val, size));
++        gint len = xdr_getpos(xdrs) - start;
++        const char *s = tvb_bytes_to_str(wmem_packet_scope(), tvb, start, len);
++
++        proto_tree_add_bytes_format_value(tree, hf, tvb, start, len, NULL, "%s", s);
+     } else {
+         proto_tree_add_item(tree, hf_libvirt_unknown, tvb, start, -1, ENC_NA);
+     }
+@@ -207,8 +191,10 @@ dissect_xdr_bytes(tvbuff_t *tvb, proto_tree *tree, XDR *xdrs, int hf,
+ 
+     start = xdr_getpos(xdrs);
+     if (xdr_bytes(xdrs, (char **)&val, &length, maxlen)) {
+-        proto_tree_add_bytes_format_value(tree, hf, tvb, start, xdr_getpos(xdrs) - start,
+-                                          NULL, "%s", format_xdr_bytes(val, length));
++        gint len = xdr_getpos(xdrs) - start;
++        const char *s = tvb_bytes_to_str(wmem_packet_scope(), tvb, start, len);
++
++        proto_tree_add_bytes_format_value(tree, hf, tvb, start, len, NULL, "%s", s);
+         /* Seems I can't call xdr_free() for this case.
+            It will raises SEGV by referencing out of bounds call stack */
+         free(val);

debian/patches/series

 backport/meson-Enable-ZFS-storage-backend-even-more-often.patch
 backport/meson-Stop-looking-up-ZFS-programs-at-build-time.patch
+backport/wireshark-Switch-to-tvb_bytes_to_str.patch
 forward/Skip-vircgrouptest.patch
 forward/Reduce-udevadm-settle-timeout-to-10-seconds.patch
 forward/Pass-GPG_TTY-env-var-to-the-ssh-binary.patch