File U_SizeClassInfo-can-return-0-even-without-an-error.patch of Package libXi.openSUSE_Leap_42.2_Update
Git-commit: b843fe1c0a6b4dbaae9f364042c6a247249305ef
Author: Niels Ole Salscheider <niels_ole@salscheider-online.de>
Subject: SizeClassInfo can return 0 even without an error
Patch-Mainline: Upstream
References: bnc#1049681
Signed-off-by: Michal Srb <msrb@suse.com>
Catch the error case separately. Commit 19a9cd607d added length checking to
SizeClassInfo but re-used the return value of 0 for an error. A device without
classes (as is initialized by xf86-input-libinput for tablets) can
legitimately return 0 and erroneously triggers an error.
Fix this by using a separate value for the error.
Reproducible by calling XListInputDevices() with a tablet attached.
This fixes a regression introduced in commit 19a9cd607d.
Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/src/XListDev.c b/src/XListDev.c
index f850cd0..e4bd3d5 100644
--- a/src/XListDev.c
+++ b/src/XListDev.c
@@ -73,27 +73,28 @@ static int pad_to_xid(int base_size)
return ((base_size + padsize - 1)/padsize) * padsize;
}
-static size_t
-SizeClassInfo(xAnyClassPtr *any, size_t len, int num_classes)
+static int
+SizeClassInfo(xAnyClassPtr *any, size_t len, int num_classes, size_t *size)
{
- int size = 0;
int j;
+ size_t sz = 0;
+
for (j = 0; j < num_classes; j++) {
switch ((*any)->class) {
case KeyClass:
- size += pad_to_xid(sizeof(XKeyInfo));
+ sz += pad_to_xid(sizeof(XKeyInfo));
break;
case ButtonClass:
- size += pad_to_xid(sizeof(XButtonInfo));
+ sz += pad_to_xid(sizeof(XButtonInfo));
break;
case ValuatorClass:
{
xValuatorInfoPtr v;
if (len < sizeof(v))
- return 0;
+ return 1;
v = (xValuatorInfoPtr) *any;
- size += pad_to_xid(sizeof(XValuatorInfo) +
+ sz += pad_to_xid(sizeof(XValuatorInfo) +
(v->num_axes * sizeof(XAxisInfo)));
break;
}
@@ -101,11 +102,13 @@ SizeClassInfo(xAnyClassPtr *any, size_t len, int num_classes)
break;
}
if ((*any)->length > len)
- return 0;
+ return 1;
*any = (xAnyClassPtr) ((char *)(*any) + (*any)->length);
}
- return size;
+ *size = sz;
+
+ return 0;
}
static void
@@ -220,8 +223,7 @@ XListInputDevices(
sav_any = any;
end = (char *)list + rlen;
for (i = 0; i < *ndevices; i++, list++) {
- s = SizeClassInfo(&any, end - (char *)any, (int)list->num_classes);
- if (!s)
+ if(SizeClassInfo(&any, end - (char *)any, (int)list->num_classes, &s))
goto out;
size += s;
}