shithub: libvpx

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vp8 boolreader: ignore invalid input

Do basic initialization even when the result will not be used.

BUG=chromium:1026961

Change-Id: Iaa480534b49efe1ecc66484b316f8d654e8a1245

--- a/vp8/decoder/dboolhuff.c

+++ b/vp8/decoder/dboolhuff.c

@@ -15,7 +15,11 @@

 int vp8dx_start_decode(BOOL_DECODER *br, const unsigned char *source,

                        unsigned int source_sz, vpx_decrypt_cb decrypt_cb,

                        void *decrypt_state) {

-  br->user_buffer_end = source + source_sz;

+  // To simplify calling code this fuction can be called with |source| == null

+  // and |source_sz| == 0. This and vp8dx_bool_decoder_fill() are essentially

+  // no-ops in this case.

+  // Work around a ubsan warning with a ternary to avoid adding 0 to null.

+  br->user_buffer_end = source ? source + source_sz : source;

   br->user_buffer = source;

   br->value = 0;

   br->count = -8;