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authorChristian König <christian.koenig@amd.com>2015-05-07 15:19:23 +0200
committerAlex Deucher <alexander.deucher@amd.com>2015-05-07 11:00:16 -0400
commita1b403da70e038ca6c6c6fe434d1d873546873a3 (patch)
treec3e96c26cd8be5da3853ba01a4e6b1cc61e9ba99 /drivers
parent29c63fe22a17c64e54016040cd882481bd45ee5a (diff)
downloadlwn-a1b403da70e038ca6c6c6fe434d1d873546873a3.tar.gz
lwn-a1b403da70e038ca6c6c6fe434d1d873546873a3.zip
drm/radeon: make UVD handle checking more strict
Invalid messages can crash the hw otherwise. Signed-off-by: Christian König <christian.koenig@amd.com> CC: stable@vger.kernel.org Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/radeon/radeon_uvd.c72
1 files changed, 43 insertions, 29 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index c10b2aec6450..f67a6aae0010 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -436,50 +436,64 @@ static int radeon_uvd_cs_msg(struct radeon_cs_parser *p, struct radeon_bo *bo,
return -EINVAL;
}
- if (msg_type == 1) {
+ switch (msg_type) {
+ case 0:
+ /* it's a create msg, calc image size (width * height) */
+ img_size = msg[7] * msg[8];
+ radeon_bo_kunmap(bo);
+
+ /* try to alloc a new handle */
+ for (i = 0; i < RADEON_MAX_UVD_HANDLES; ++i) {
+ if (atomic_read(&p->rdev->uvd.handles[i]) == handle) {
+ DRM_ERROR("Handle 0x%x already in use!\n", handle);
+ return -EINVAL;
+ }
+
+ if (!atomic_cmpxchg(&p->rdev->uvd.handles[i], 0, handle)) {
+ p->rdev->uvd.filp[i] = p->filp;
+ p->rdev->uvd.img_size[i] = img_size;
+ return 0;
+ }
+ }
+
+ DRM_ERROR("No more free UVD handles!\n");
+ return -EINVAL;
+
+ case 1:
/* it's a decode msg, calc buffer sizes */
r = radeon_uvd_cs_msg_decode(msg, buf_sizes);
- /* calc image size (width * height) */
- img_size = msg[6] * msg[7];
radeon_bo_kunmap(bo);
if (r)
return r;
- } else if (msg_type == 2) {
+ /* validate the handle */
+ for (i = 0; i < RADEON_MAX_UVD_HANDLES; ++i) {
+ if (atomic_read(&p->rdev->uvd.handles[i]) == handle) {
+ if (p->rdev->uvd.filp[i] != p->filp) {
+ DRM_ERROR("UVD handle collision detected!\n");
+ return -EINVAL;
+ }
+ return 0;
+ }
+ }
+
+ DRM_ERROR("Invalid UVD handle 0x%x!\n", handle);
+ return -ENOENT;
+
+ case 2:
/* it's a destroy msg, free the handle */
for (i = 0; i < RADEON_MAX_UVD_HANDLES; ++i)
atomic_cmpxchg(&p->rdev->uvd.handles[i], handle, 0);
radeon_bo_kunmap(bo);
return 0;
- } else {
- /* it's a create msg, calc image size (width * height) */
- img_size = msg[7] * msg[8];
- radeon_bo_kunmap(bo);
- if (msg_type != 0) {
- DRM_ERROR("Illegal UVD message type (%d)!\n", msg_type);
- return -EINVAL;
- }
-
- /* it's a create msg, no special handling needed */
- }
-
- /* create or decode, validate the handle */
- for (i = 0; i < RADEON_MAX_UVD_HANDLES; ++i) {
- if (atomic_read(&p->rdev->uvd.handles[i]) == handle)
- return 0;
- }
+ default:
- /* handle not found try to alloc a new one */
- for (i = 0; i < RADEON_MAX_UVD_HANDLES; ++i) {
- if (!atomic_cmpxchg(&p->rdev->uvd.handles[i], 0, handle)) {
- p->rdev->uvd.filp[i] = p->filp;
- p->rdev->uvd.img_size[i] = img_size;
- return 0;
- }
+ DRM_ERROR("Illegal UVD message type (%d)!\n", msg_type);
+ return -EINVAL;
}
- DRM_ERROR("No more free UVD handles!\n");
+ BUG();
return -EINVAL;
}