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Diffstat (limited to 'src/XListDev.c')
-rw-r--r--src/XListDev.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/src/XListDev.c b/src/XListDev.c
index 1c14b96..b85ff3c 100644
--- a/src/XListDev.c
+++ b/src/XListDev.c
@@ -73,7 +73,7 @@ static int pad_to_xid(int base_size)
return ((base_size + padsize - 1)/padsize) * padsize;
}
-static int
+static size_t
SizeClassInfo(xAnyClassPtr *any, int num_classes)
{
int size = 0;
@@ -170,7 +170,7 @@ XListInputDevices(
register Display *dpy,
int *ndevices)
{
- int size;
+ size_t size;
xListInputDevicesReq *req;
xListInputDevicesReply rep;
xDeviceInfo *list, *slist = NULL;
@@ -178,7 +178,7 @@ XListInputDevices(
XDeviceInfo *clist = NULL;
xAnyClassPtr any, sav_any;
XAnyClassPtr Any;
- char *nptr, *Nptr;
+ unsigned char *nptr, *Nptr;
int i;
unsigned long rlen;
XExtDisplayInfo *info = XInput_find_display(dpy);
@@ -217,9 +217,12 @@ XListInputDevices(
size += SizeClassInfo(&any, (int)list->num_classes);
}
- for (i = 0, nptr = (char *)any; i < *ndevices; i++) {
+ Nptr = ((unsigned char *)list) + rlen + 1;
+ for (i = 0, nptr = (unsigned char *)any; i < *ndevices; i++) {
size += *nptr + 1;
nptr += (*nptr + 1);
+ if (nptr > Nptr)
+ goto out;
}
clist = (XDeviceInfoPtr) Xmalloc(size);
@@ -245,8 +248,8 @@ XListInputDevices(
}
clist = sclist;
- nptr = (char *)any;
- Nptr = (char *)Any;
+ nptr = (unsigned char *)any;
+ Nptr = (unsigned char *)Any;
for (i = 0; i < *ndevices; i++, clist++) {
clist->name = (char *)Nptr;
memcpy(Nptr, nptr + 1, *nptr);
@@ -256,6 +259,7 @@ XListInputDevices(
}
}
+ out:
XFree((char *)slist);
UnlockDisplay(dpy);
SyncHandle();