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drm/radeon: make VCE handle check more strict

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Invalid handles can crash the hw.

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 15:19:22 +02:00 committed by Alex Deucher
parent 247c405098
commit 29c63fe22a
1 changed files with 48 additions and 17 deletions
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65
drivers/gpu/drm/radeon/radeon_vce.c
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@ -493,18 +493,27 @@ int radeon_vce_cs_reloc(struct radeon_cs_parser *p, int lo, int hi,
*
* @p: parser context
* @handle: handle to validate
* @allocated: allocated a new handle?
*
* Validates the handle and return the found session index or -EINVAL
* we we don't have another free session index.
*/
int radeon_vce_validate_handle(struct radeon_cs_parser *p, uint32_t handle)
static int radeon_vce_validate_handle(struct radeon_cs_parser *p,
uint32_t handle, bool *allocated)
{
unsigned i;
*allocated = false;
/* validate the handle */
for (i = 0; i < RADEON_MAX_VCE_HANDLES; ++i) {
if (atomic_read(&p->rdev->vce.handles[i]) == handle)
if (atomic_read(&p->rdev->vce.handles[i]) == handle) {
if (p->rdev->vce.filp[i] != p->filp) {
DRM_ERROR("VCE handle collision detected!\n");
return -EINVAL;
}
return i;
}
}
/* handle not found try to alloc a new one */
@ -512,6 +521,7 @@ int radeon_vce_validate_handle(struct radeon_cs_parser *p, uint32_t handle)
if (!atomic_cmpxchg(&p->rdev->vce.handles[i], 0, handle)) {
p->rdev->vce.filp[i] = p->filp;
p->rdev->vce.img_size[i] = 0;
*allocated = true;
return i;
}
}
@ -529,10 +539,10 @@ int radeon_vce_validate_handle(struct radeon_cs_parser *p, uint32_t handle)
int radeon_vce_cs_parse(struct radeon_cs_parser *p)
{
int session_idx = -1;
bool destroyed = false;
bool destroyed = false, created = false, allocated = false;
uint32_t tmp, handle = 0;
uint32_t *size = &tmp;
int i, r;
int i, r = 0;
while (p->idx < p->chunk_ib->length_dw) {
uint32_t len = radeon_get_ib_value(p, p->idx);
@ -540,18 +550,21 @@ int radeon_vce_cs_parse(struct radeon_cs_parser *p)
if ((len < 8) || (len & 3)) {
DRM_ERROR("invalid VCE command length (%d)!\n", len);
return -EINVAL;
r = -EINVAL;
goto out;
}
if (destroyed) {
DRM_ERROR("No other command allowed after destroy!\n");
return -EINVAL;
r = -EINVAL;
goto out;
}
switch (cmd) {
case 0x00000001: // session
handle = radeon_get_ib_value(p, p->idx + 2);
session_idx = radeon_vce_validate_handle(p, handle);
session_idx = radeon_vce_validate_handle(p, handle,
&allocated);
if (session_idx < 0)
return session_idx;
size = &p->rdev->vce.img_size[session_idx];
@ -561,6 +574,13 @@ int radeon_vce_cs_parse(struct radeon_cs_parser *p)
break;
case 0x01000001: // create
created = true;
if (!allocated) {
DRM_ERROR("Handle already in use!\n");
r = -EINVAL;
goto out;
}
*size = radeon_get_ib_value(p, p->idx + 8) *
radeon_get_ib_value(p, p->idx + 10) *
8 * 3 / 2;
@ -578,12 +598,12 @@ int radeon_vce_cs_parse(struct radeon_cs_parser *p)
r = radeon_vce_cs_reloc(p, p->idx + 10, p->idx + 9,
*size);
if (r)
return r;
goto out;
r = radeon_vce_cs_reloc(p, p->idx + 12, p->idx + 11,
*size / 3);
if (r)
return r;
goto out;
break;
case 0x02000001: // destroy
@ -594,7 +614,7 @@ int radeon_vce_cs_parse(struct radeon_cs_parser *p)
r = radeon_vce_cs_reloc(p, p->idx + 3, p->idx + 2,
*size * 2);
if (r)
return r;
goto out;
break;
case 0x05000004: // video bitstream buffer
@ -602,36 +622,47 @@ int radeon_vce_cs_parse(struct radeon_cs_parser *p)
r = radeon_vce_cs_reloc(p, p->idx + 3, p->idx + 2,
tmp);
if (r)
return r;
goto out;
break;
case 0x05000005: // feedback buffer
r = radeon_vce_cs_reloc(p, p->idx + 3, p->idx + 2,
4096);
if (r)
return r;
goto out;
break;
default:
DRM_ERROR("invalid VCE command (0x%x)!\n", cmd);
return -EINVAL;
r = -EINVAL;
goto out;
}
if (session_idx == -1) {
DRM_ERROR("no session command at start of IB\n");
return -EINVAL;
r = -EINVAL;
goto out;
}
p->idx += len / 4;
}
if (destroyed) {
/* IB contains a destroy msg, free the handle */
if (allocated && !created) {
DRM_ERROR("New session without create command!\n");
r = -ENOENT;
}
out:
if ((!r && destroyed) || (r && allocated)) {
/*
* IB contains a destroy msg or we have allocated an
* handle and got an error, anyway free the handle
*/
for (i = 0; i < RADEON_MAX_VCE_HANDLES; ++i)
atomic_cmpxchg(&p->rdev->vce.handles[i], handle, 0);
}
return 0;
return r;
}
/**