diff options
Diffstat (limited to 'src/gallium/auxiliary/util/u_vbuf.c')
| -rw-r--r-- | src/gallium/auxiliary/util/u_vbuf.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/gallium/auxiliary/util/u_vbuf.c b/src/gallium/auxiliary/util/u_vbuf.c index f040f4a882d..7d4a44b19d7 100644 --- a/src/gallium/auxiliary/util/u_vbuf.c +++ b/src/gallium/auxiliary/util/u_vbuf.c @@ -423,8 +423,22 @@ u_vbuf_translate_buffers(struct u_vbuf *mgr, struct translate_key *key, unsigned size = vb->stride ? num_vertices * vb->stride : sizeof(double)*4; - if (offset+size > vb->buffer->width0) { + if (offset + size > vb->buffer->width0) { + /* Don't try to map past end of buffer. This often happens when + * we're translating an attribute that's at offset > 0 from the + * start of the vertex. If we'd subtract attrib's offset from + * the size, this probably wouldn't happen. + */ size = vb->buffer->width0 - offset; + + /* Also adjust num_vertices. A common user error is to call + * glDrawRangeElements() with incorrect 'end' argument. The 'end + * value should be the max index value, but people often + * accidentally add one to this value. This adjustment avoids + * crashing (by reading past the end of a hardware buffer mapping) + * when people do that. + */ + num_vertices = (size + vb->stride - 1) / vb->stride; } map = pipe_buffer_map_range(mgr->pipe, vb->buffer, offset, size, |