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sf: Add a NULL check in getDisplayConfigs 

Validate the display binder by adding a NULL check in getDisplayConfigs.
This will prevent a false match if the caller queries the display
configs for an inactive display (whose binder is NULL by default).

Without this change we might end up attempting to index the display
config array, which is unpopulated for inactive displays, and this will
result in a crash. (See getDisplayInfo in SurfaceComposerClient.cpp for
an example of this scenario)

Change-Id: I1a12f43b7c375b9c01998dadd5b658275c733fb2
Acked-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>
This commit is contained in:
Naseer Ahmed 2014-11-03 14:49:23 -05:00 committed by Jesse Hall
parent 793fc0e13d
commit 7aa0c47e42
1 changed files with 3 additions and 0 deletions
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3
services/surfaceflinger/SurfaceFlinger.cpp
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@ -507,6 +507,9 @@ status_t SurfaceFlinger::getDisplayConfigs(const sp<IBinder>& display,
return BAD_VALUE;
}
if (!display.get())
return NAME_NOT_FOUND;
int32_t type = NAME_NOT_FOUND;
for (int i=0 ; i<DisplayDevice::NUM_BUILTIN_DISPLAY_TYPES ; i++) {
if (display == mBuiltinDisplays[i]) {