From 899e154f9546fcae18065d74064889d08fff62c2 Mon Sep 17 00:00:00 2001
From: Zack Rusin <zack.rusin@broadcom.com>
Date: Wed, 10 Jan 2024 15:03:05 -0500
Subject: [PATCH] drm/vmwgfx: Fix possible null pointer derefence with invalid
contexts
[ Upstream commit 517621b7060096e48e42f545fa6646fc00252eac ]
vmw_context_cotable can return either an error or a null pointer and its
usage sometimes went unchecked. Subsequent code would then try to access
either a null pointer or an error value.
The invalid dereferences were only possible with malformed userspace
apps which never properly initialized the rendering contexts.
Check the results of vmw_context_cotable to fix the invalid derefs.
Thanks:
ziming zhang(@ezrak1e) from Ant Group Light-Year Security Lab
who was the first person to discover it.
Niels De Graef who reported it and helped to track down the poc.
Fixes: 9c079b8ce8bf ("drm/vmwgfx: Adapt execbuf to the new validation api")
Cc: <stable@vger.kernel.org> # v4.20+
Reported-by: Niels De Graef <ndegraef@redhat.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Cc: Martin Krastev <martin.krastev@broadcom.com>
Cc: Maaz Mombasawala <maaz.mombasawala@broadcom.com>
Cc: Ian Forbes <ian.forbes@broadcom.com>
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Maaz Mombasawala <maaz.mombasawala@broadcom.com>
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240110200305.94086-1-zack.rusin@broadcom.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index b91f8d17404d..21134c7f1838 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -472,7 +472,7 @@ static int vmw_resource_context_res_add(struct vmw_private *dev_priv,
vmw_res_type(ctx) == vmw_res_dx_context) {
for (i = 0; i < cotable_max; ++i) {
res = vmw_context_cotable(ctx, i);
- if (IS_ERR(res))
+ if (IS_ERR_OR_NULL(res))
continue;
ret = vmw_execbuf_res_noctx_val_add(sw_context, res,
@@ -1277,6 +1277,8 @@ static int vmw_cmd_dx_define_query(struct vmw_private *dev_priv,
return -EINVAL;
cotable_res = vmw_context_cotable(ctx_node->ctx, SVGA_COTABLE_DXQUERY);
+ if (IS_ERR_OR_NULL(cotable_res))
+ return cotable_res ? PTR_ERR(cotable_res) : -EINVAL;
ret = vmw_cotable_notify(cotable_res, cmd->body.queryId);
return ret;
@@ -2455,6 +2457,8 @@ static int vmw_cmd_dx_view_define(struct vmw_private *dev_priv,
return ret;
res = vmw_context_cotable(ctx_node->ctx, vmw_view_cotables[view_type]);
+ if (IS_ERR_OR_NULL(res))
+ return res ? PTR_ERR(res) : -EINVAL;
ret = vmw_cotable_notify(res, cmd->defined_id);
if (unlikely(ret != 0))
return ret;
@@ -2540,8 +2544,8 @@ static int vmw_cmd_dx_so_define(struct vmw_private *dev_priv,
so_type = vmw_so_cmd_to_type(header->id);
res = vmw_context_cotable(ctx_node->ctx, vmw_so_cotables[so_type]);
- if (IS_ERR(res))
- return PTR_ERR(res);
+ if (IS_ERR_OR_NULL(res))
+ return res ? PTR_ERR(res) : -EINVAL;
cmd = container_of(header, typeof(*cmd), header);
ret = vmw_cotable_notify(res, cmd->defined_id);
@@ -2660,6 +2664,8 @@ static int vmw_cmd_dx_define_shader(struct vmw_private *dev_priv,
return -EINVAL;
res = vmw_context_cotable(ctx_node->ctx, SVGA_COTABLE_DXSHADER);
+ if (IS_ERR_OR_NULL(res))
+ return res ? PTR_ERR(res) : -EINVAL;
ret = vmw_cotable_notify(res, cmd->body.shaderId);
if (ret)
return ret;
@@ -2981,6 +2987,8 @@ static int vmw_cmd_dx_define_streamoutput(struct vmw_private *dev_priv,
}
res = vmw_context_cotable(ctx_node->ctx, SVGA_COTABLE_STREAMOUTPUT);
+ if (IS_ERR_OR_NULL(res))
+ return res ? PTR_ERR(res) : -EINVAL;
ret = vmw_cotable_notify(res, cmd->body.soid);
if (ret)
return ret;