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dri2: Protect against dri2ClientPrivate assertion failures

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If DRI2ScreenInit hasn't been called yet, DRI2Authenticate and
DRI2CreateDrawable2 cause the X server to crash. This has been observed
to happen on multiple modern Linux distros in various conditions,
including QEMU and VMware VMs. Make these functions more robust in order
to prevent the crash.

This patch was originally provided by Bernhard Übelacker and expanded
upon by Mark Wagner.

Signed-off-by: Doug Brown <doug@schmorgal.com>
Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1053
Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1534
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1608>
(cherry picked from commit a0834009cf)
This commit is contained in:
Doug Brown 2024-07-15 19:44:23 -07:00 • committed by Alan Coopersmith
parent 75105fae65
commit 0fcef31fd8
1 changed files with 12 additions and 2 deletions
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14
hw/xfree86/dri2/dri2.c
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@ -356,10 +356,15 @@ DRI2CreateDrawable2(ClientPtr client, DrawablePtr pDraw, XID id,
XID *dri2_id_out)
{
DRI2DrawablePtr pPriv;
DRI2ClientPtr dri2_client = dri2ClientPrivate(client);
DRI2ClientPtr dri2_client;
XID dri2_id;
int rc;
if (!dixPrivateKeyRegistered(dri2ScreenPrivateKey))
return BadValue;
dri2_client = dri2ClientPrivate(client);
pPriv = DRI2GetDrawable(pDraw);
if (pPriv == NULL)
pPriv = DRI2AllocateDrawable(pDraw);
@ -1362,9 +1367,14 @@ Bool
DRI2Authenticate(ClientPtr client, ScreenPtr pScreen, uint32_t magic)
{
DRI2ScreenPtr ds;
DRI2ClientPtr dri2_client = dri2ClientPrivate(client);
DRI2ClientPtr dri2_client;
ScreenPtr primescreen;
if (!dixPrivateKeyRegistered(dri2ScreenPrivateKey))
return FALSE;
dri2_client = dri2ClientPrivate(client);
ds = DRI2GetScreenPrime(pScreen, dri2_client->prime_id);
if (ds == NULL)
return FALSE;