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drm/radeon/kms: drop zero length CS indirect buffers.

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If userspace sends a zero length IB, it really shouldn't have bothered
so EINVAL it.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2009-06-30 11:47:14 +10:00
parent e7168cab5b
commit 5176fdc4c5
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/radeon/radeon_cs.c
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@ -127,17 +127,23 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
sizeof(struct drm_radeon_cs_chunk))) {
return -EFAULT;
}
p->chunks[i].length_dw = user_chunk.length_dw;
p->chunks[i].kdata = NULL;
p->chunks[i].chunk_id = user_chunk.chunk_id;
if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_RELOCS) {
p->chunk_relocs_idx = i;
}
if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_IB) {
p->chunk_ib_idx = i;
/* zero length IB isn't useful */
if (p->chunks[i].length_dw == 0)
return -EINVAL;
}
p->chunks[i].length_dw = user_chunk.length_dw;
cdata = (uint32_t *)(unsigned long)user_chunk.chunk_data;
p->chunks[i].kdata = NULL;
size = p->chunks[i].length_dw * sizeof(uint32_t);
p->chunks[i].kdata = kzalloc(size, GFP_KERNEL);
if (p->chunks[i].kdata == NULL) {