_mesa_lookup_texture_err() is not currently checking that the
texture-id can be zero, but _mesa_HashLookup() doesn't expect the key
to be zero, and will fail an assertion (crashing the driver on debug mode).
Considering that _mesa_lookup_texture_err() is called from
_mesa_GetTextureImage and _mesa_GetTextureSubImage with user provided
arguments, we must validate the texture-id before looking the texture
up in the hash table.
---
src/mesa/main/texobj.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
index fbd498d..e5b7070 100644
--- a/src/mesa/main/texobj.c
+++ b/src/mesa/main/texobj.c
@@ -116,9 +116,10 @@ _mesa_lookup_texture(struct gl_context *ctx, GLuint id)
struct gl_texture_object *
_mesa_lookup_texture_err(struct gl_context *ctx, GLuint id, const char* func)
{
- struct gl_texture_object *texObj;
+ struct gl_texture_object *texObj = NULL;
- texObj = _mesa_lookup_texture(ctx, id); /* Returns NULL if not found. */
+ if (id > 0)
+ texObj = _mesa_lookup_texture(ctx, id); /* Returns NULL if not found. */
if (!texObj)
_mesa_error(ctx, GL_INVALID_OPERATION, "%s(texture)", func);
--
2.10.2
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