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glx: Fix previous context validation in xorgGlxMakeCurrent 

vnd has already verified that the context tag is valid before this gets
called, and we only set the context tag private data to non-null for
indirect clients. Mesa happens to be buggy and doesn't send MakeCurrent
requests nearly as much as it should for direct contexts, but if you fix
that, then unbinding a direct context would fail here with
GLXBadContextTag.

Sadly Mesa will still need to carry a workaround here for broken
servers, but we should still fix the server.

(cherry picked from commit 95dcc81cb1)
This commit is contained in:
Adam Jackson 2019-08-16 14:56:19 -04:00
parent 8449c8623d
commit 045add8492
1 changed files with 1 additions and 3 deletions
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4
glx/glxcmds.c
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@ -574,10 +574,8 @@ xorgGlxMakeCurrent(ClientPtr client, GLXContextTag tag, XID drawId, XID readId,
/* Look up old context. If we have one, it must be in a usable state. */
if (tag != 0) {
prevglxc = glxServer.getContextTagPrivate(client, tag);
if (!prevglxc)
return __glXError(GLXBadContextTag);
if (prevglxc->renderMode != GL_RENDER) {
if (prevglxc && prevglxc->renderMode != GL_RENDER) {
/* Oops. Not in render mode render. */
client->errorValue = prevglxc->id;
return __glXError(GLXBadContextState);