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cogl-matrix-stack: fix use after free in matrix stack.

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If the matrix was reallocated we would use values from the stack
for the matrix parameters. This fixes that and also uses the
function instead of out of lining the same code.

https://bugzilla.gnome.org/show_bug.cgi?id=671985

Reviewed-by: Robert Bragg <robert@linux.intel.com>
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Dave Airlie 2012-03-13 13:03:57 +00:00 committed by Robert Bragg
parent 46b1727705
commit d42efa3741
1 changed files with 5 additions and 2 deletions
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7
cogl/cogl-matrix-stack.c
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@ -110,8 +110,11 @@ _cogl_matrix_stack_top_mutable (CoglMatrixStack *stack,
state->push_count -= 1;
g_array_set_size (stack->stack, stack->stack->len + 1);
new_top = &g_array_index (stack->stack, CoglMatrixState,
stack->stack->len - 1);
/* if g_array_set_size reallocs we need to get state
* pointer again */
state = &g_array_index (stack->stack, CoglMatrixState,
stack->stack->len - 2);
new_top = _cogl_matrix_stack_top(stack);
_cogl_matrix_state_init (new_top);
if (initialize)