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authorKeith Whitwell <[email protected]>2009-09-23 14:40:45 +0100
committerKeith Whitwell <[email protected]>2009-09-23 18:55:46 +0100
commitbe66ff51ec98cf583044b3e53a49c41edd803134 (patch)
tree9833d492c1dcf466e029ae1e1cf262138d952f98
parentbc7546476078dd520af4853f6f0d3f577ec670ec (diff)
st/mesa: trim calculated userbuffer size
In get_array_bounds we were previously defining a user buffer sized as (nr_vertices * stride). The trouble is that if the vertex data occupies less than stride bytes, the extra tailing (stride - size) bytes may extend outside the memory actually allocated by the app and caused a segfault. To fix this, define a the buffer bounds to be: ptr .. ptr + (nr-1)*stride + element_size
-rw-r--r--src/mesa/state_tracker/st_draw.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/src/mesa/state_tracker/st_draw.c b/src/mesa/state_tracker/st_draw.c
index 225541a30ba..11699d5b1ba 100644
--- a/src/mesa/state_tracker/st_draw.c
+++ b/src/mesa/state_tracker/st_draw.c
@@ -317,23 +317,29 @@ get_arrays_bounds(const struct st_vertex_program *vp,
const GLubyte **low, const GLubyte **high)
{
const GLubyte *low_addr = NULL;
+ const GLubyte *high_addr = NULL;
GLuint attr;
- GLint stride;
for (attr = 0; attr < vp->num_inputs; attr++) {
const GLuint mesaAttr = vp->index_to_input[attr];
+ const GLint stride = arrays[mesaAttr]->StrideB;
const GLubyte *start = arrays[mesaAttr]->Ptr;
- stride = arrays[mesaAttr]->StrideB;
+ const unsigned sz = (arrays[mesaAttr]->Size *
+ _mesa_sizeof_type(arrays[mesaAttr]->Type));
+ const GLubyte *end = start + (max_index * stride) + sz;
+
if (attr == 0) {
low_addr = start;
+ high_addr = end;
}
else {
low_addr = MIN2(low_addr, start);
+ high_addr = MAX2(high_addr, end);
}
}
*low = low_addr;
- *high = low_addr + (max_index + 1) * stride;
+ *high = high_addr;
}