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authorFrank Henigman <fjhenigman@google.com>2012-12-14 15:52:17 -0500
committerStéphane Marchesin <marcheu@chromium.org>2012-12-21 11:23:48 -0800
commit46e3aeb07702f57d389fbfcade9d4ef66218dc53 (patch)
treec5fa084730adbf302287e6e07e132b512d4f209f /src/mesa/main/uniform_query.cpp
parent74f07319533d39a509ddc3159a51cfe89cd47225 (diff)
mesa: add bounds checking for uniform array access
No piglit regressions and now passes glsl-uniform-out-of-bounds-2. validate_uniform_parameters now checks that the array index is valid. This means if an index is out of bounds, glGetUniform* now fails with GL_INVALID_OPERATION, as it should. _mesa_uniform and _mesa_uniform_matrix also call validate_uniform_parameters so the bounds checks there became redundant and were removed. The test in glGetUniformLocation is modified to check array bounds so it now returns GL_INVALID_INDEX (-1) if you ask for the location of a non-existent array element, as it should. Signed-off-by: Frank Henigman <fjhenigman@google.com> Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Diffstat (limited to 'src/mesa/main/uniform_query.cpp')
-rw-r--r--src/mesa/main/uniform_query.cpp26
1 files changed, 13 insertions, 13 deletions
diff --git a/src/mesa/main/uniform_query.cpp b/src/mesa/main/uniform_query.cpp
index b6b73d16fc9..142ad1fbdc0 100644
--- a/src/mesa/main/uniform_query.cpp
+++ b/src/mesa/main/uniform_query.cpp
@@ -241,11 +241,14 @@ validate_uniform_parameters(struct gl_context *ctx,
return false;
}
- /* This case should be impossible. The implication is that a call like
- * glGetUniformLocation(prog, "foo[8]") was successful but "foo" is not an
- * array.
+ /* If the uniform is an array, check that array_index is in bounds.
+ * If not an array, check that array_index is zero.
+ * array_index is unsigned so no need to check for less than zero.
*/
- if (*array_index != 0 && shProg->UniformStorage[*loc].array_elements == 0) {
+ unsigned limit = shProg->UniformStorage[*loc].array_elements;
+ if (limit == 0)
+ limit = 1;
+ if (*array_index >= limit) {
_mesa_error(ctx, GL_INVALID_OPERATION, "%s(location=%d)",
caller, location);
return false;
@@ -732,9 +735,6 @@ _mesa_uniform(struct gl_context *ctx, struct gl_shader_program *shProg,
* will have already generated an error.
*/
if (uni->array_elements != 0) {
- if (offset >= uni->array_elements)
- return;
-
count = MIN2(count, (int) (uni->array_elements - offset));
}
@@ -889,9 +889,6 @@ _mesa_uniform_matrix(struct gl_context *ctx, struct gl_shader_program *shProg,
* will have already generated an error.
*/
if (uni->array_elements != 0) {
- if (offset >= uni->array_elements)
- return;
-
count = MIN2(count, (int) (uni->array_elements - offset));
}
@@ -1025,10 +1022,13 @@ _mesa_get_uniform_location(struct gl_context *ctx,
if (!found)
return GL_INVALID_INDEX;
- /* Since array_elements is 0 for non-arrays, this causes look-ups of 'a[0]'
- * to (correctly) fail if 'a' is not an array.
+ /* If the uniform is an array, fail if the index is out of bounds.
+ * (A negative index is caught above.) This also fails if the uniform
+ * is not an array, but the user is trying to index it, because
+ * array_elements is zero and offset >= 0.
*/
- if (array_lookup && shProg->UniformStorage[location].array_elements == 0) {
+ if (array_lookup
+ && offset >= shProg->UniformStorage[location].array_elements) {
return GL_INVALID_INDEX;
}