From 419a27b5219a739f2fbd50cc96a1b54c469e4a88 Mon Sep 17 00:00:00 2001 From: Peter Hutterer Date: Tue, 12 Apr 2011 10:17:07 +1000 Subject: [PATCH] Xi: fix valuator alignment in DeepCopyDeviceClasses (#36119) commit 678f5396c91b3d0c7572ed579b0a4fb62b2b4655 only fixed the initialization, not the copy. After a slave device change, the valuator were out of alignment again. X.Org Bug 36119 Signed-off-by: Peter Hutterer Reviewed-by: Jeremy Huddleston --- Xi/exevents.c | 11 ++++------- dix/devices.c | 47 ++++++++++++++++++++++++++++++++++++---------- include/input.h | 5 +++++ include/inputstr.h | 2 +- test/input.c | 24 ++++++++++++++++++++++- 5 files changed, 70 insertions(+), 19 deletions(-) diff --git a/Xi/exevents.c b/Xi/exevents.c index 18803c95e..76d5c3759 100644 --- a/Xi/exevents.c +++ b/Xi/exevents.c @@ -535,6 +535,7 @@ DeepCopyPointerClasses(DeviceIntPtr from, DeviceIntPtr to) if (from->valuator) { ValuatorClassPtr v; + if (!to->valuator) { classes = to->unused_classes; @@ -543,18 +544,14 @@ DeepCopyPointerClasses(DeviceIntPtr from, DeviceIntPtr to) classes->valuator = NULL; } - to->valuator = realloc(to->valuator, sizeof(ValuatorClassRec) + - from->valuator->numAxes * sizeof(AxisInfo) + - from->valuator->numAxes * sizeof(double)); - v = to->valuator; + v = AllocValuatorClass(to->valuator, from->valuator->numAxes); + if (!v) FatalError("[Xi] no memory for class shift.\n"); - v->numAxes = from->valuator->numAxes; - v->axes = (AxisInfoPtr)&v[1]; + to->valuator = v; memcpy(v->axes, from->valuator->axes, v->numAxes * sizeof(AxisInfo)); - v->axisVal = (double*)(v->axes + from->valuator->numAxes); v->sourceid = from->id; } else if (to->valuator && !from->valuator) { diff --git a/dix/devices.c b/dix/devices.c index 534931c3e..58bda0de0 100644 --- a/dix/devices.c +++ b/dix/devices.c @@ -1221,13 +1221,46 @@ InitButtonClassDeviceStruct(DeviceIntPtr dev, int numButtons, Atom* labels, return TRUE; } +/** + * Allocate a valuator class and set up the pointers for the axis values + * appropriately. + * + * @param src If non-NULL, the memory is reallocated from src. If NULL, the + * memory is calloc'd. + * @parma numAxes Number of axes to allocate. + * @return The allocated valuator struct. + */ +ValuatorClassPtr +AllocValuatorClass(ValuatorClassPtr src, int numAxes) +{ + ValuatorClassPtr v; + /* force alignment with double */ + union align_u { ValuatorClassRec valc; double d; } *align; + int size; + + size = sizeof(union align_u) + numAxes * (sizeof(double) + sizeof(AxisInfo)); + align = (union align_u *) realloc(src, size); + + if (!align) + return NULL; + + if (!src) + memset(align, 0, size); + + v = &align->valc; + v->numAxes = numAxes; + v->axisVal = (double*)(align + 1); + v->axes = (AxisInfoPtr)(v->axisVal + numAxes); + + return v; +} + Bool InitValuatorClassDeviceStruct(DeviceIntPtr dev, int numAxes, Atom *labels, int numMotionEvents, int mode) { int i; ValuatorClassPtr valc; - union align_u { ValuatorClassRec valc; double d; } *align; if (!dev) return FALSE; @@ -1240,13 +1273,10 @@ InitValuatorClassDeviceStruct(DeviceIntPtr dev, int numAxes, Atom *labels, numAxes = MAX_VALUATORS; } - align = (union align_u *) calloc(1, sizeof(union align_u) + - numAxes * sizeof(double) + - numAxes * sizeof(AxisInfo)); - if (!align) - return FALSE; + valc = AllocValuatorClass(NULL, numAxes); + if (!valc) + return FALSE; - valc = &align->valc; valc->sourceid = dev->id; valc->motion = NULL; valc->first_motion = 0; @@ -1254,9 +1284,6 @@ InitValuatorClassDeviceStruct(DeviceIntPtr dev, int numAxes, Atom *labels, valc->numMotionEvents = numMotionEvents; valc->motionHintWindow = NullWindow; - valc->numAxes = numAxes; - valc->axisVal = (double *)(align + 1); - valc->axes = (AxisInfoPtr)(valc->axisVal + numAxes); if (mode & OutOfProximity) InitProximityClassDeviceStruct(dev); diff --git a/include/input.h b/include/input.h index 2bb85ffaa..4aad30484 100644 --- a/include/input.h +++ b/include/input.h @@ -102,6 +102,7 @@ typedef unsigned long Leds; typedef struct _OtherClients *OtherClientsPtr; typedef struct _InputClients *InputClientsPtr; typedef struct _DeviceIntRec *DeviceIntPtr; +typedef struct _ValuatorClassRec *ValuatorClassPtr; typedef struct _ClassesRec *ClassesPtr; typedef struct _SpriteRec *SpritePtr; typedef union _GrabMask GrabMask; @@ -300,6 +301,10 @@ extern _X_EXPORT Bool InitButtonClassDeviceStruct( Atom* /* labels */, CARD8* /*map*/); +extern _X_INTERNAL ValuatorClassPtr AllocValuatorClass( + ValuatorClassPtr src, + int numAxes); + extern _X_EXPORT Bool InitValuatorClassDeviceStruct( DeviceIntPtr /*device*/, int /*numAxes*/, diff --git a/include/inputstr.h b/include/inputstr.h index f63df8087..bd7c78dec 100644 --- a/include/inputstr.h +++ b/include/inputstr.h @@ -283,7 +283,7 @@ typedef struct _ValuatorClassRec { unsigned short numAxes; double *axisVal; /* always absolute, but device-coord system */ ValuatorAccelerationRec accelScheme; -} ValuatorClassRec, *ValuatorClassPtr; +} ValuatorClassRec; typedef struct _ButtonClassRec { int sourceid; diff --git a/test/input.c b/test/input.c index c13b4f213..89cce3f33 100644 --- a/test/input.c +++ b/test/input.c @@ -1209,6 +1209,28 @@ static void include_bit_test_macros(void) } } +/** + * Ensure that val->axisVal and val->axes are aligned on doubles. + */ +static void dix_valuator_alloc(void) +{ + ValuatorClassPtr v = NULL; + int num_axes = 0; + + while (num_axes < 5) + { + v = AllocValuatorClass(v, num_axes); + + g_assert(v); + g_assert(v->numAxes == num_axes); + g_assert(((void*)v->axisVal - (void*)v) % sizeof(double) == 0); + g_assert(((void*)v->axes - (void*)v) % sizeof(double) == 0); + num_axes ++; + } + + free(v); +} + int main(int argc, char** argv) { g_test_init(&argc, &argv,NULL); @@ -1226,7 +1248,7 @@ int main(int argc, char** argv) g_test_add_func("/include/byte_padding_macros", include_byte_padding_macros); g_test_add_func("/include/bit_test_macros", include_bit_test_macros); g_test_add_func("/Xi/xiproperty/register-unregister", xi_unregister_handlers); - + g_test_add_func("/dix/input/valuator-alloc", dix_valuator_alloc); return g_test_run(); }