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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>
This commit is contained in:
Christian König 2015-05-07 15:19:23 +02:00 committed by Alex Deucher
parent 29c63fe22a
commit a1b403da70
1 changed files with 43 additions and 29 deletions
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72
drivers/gpu/drm/radeon/radeon_uvd.c
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@ -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;
}
default:
/* it's a create msg, no special handling needed */
DRM_ERROR("Illegal UVD message type (%d)!\n", msg_type);
return -EINVAL;
}
/* 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;
}
/* 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("No more free UVD handles!\n");
BUG();
return -EINVAL;
}