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freedreno/ir3: Fix use after free

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If the tex/sfu ssa src is from a different block than the one currently
being scheduled, we do not have a valid sched-node.  So fallback to
previous behavior rather than dereference an invalid ptr.

Fixes: 7821e5a3f8 ("ir3/sched: Don't penalize uses of already-waited tex/SFU")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10306>
(cherry picked from commit 09f64f74db)
This commit is contained in:
Rob Clark 2021-04-18 09:10:07 -07:00 • committed by Eric Engestrom
parent 3c7b57988f
commit 23cb39dc66
2 changed files with 13 additions and 1 deletions
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2
.pick_status.json
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@ -787,7 +787,7 @@
"description": "freedreno/ir3: Fix use after free",
"nominated": true,
"nomination_type": 1,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": "7821e5a3f8d593e1e9738924f5f4dc5996583518"
},

12
src/freedreno/ir3/ir3_sched.c
View file

@ -194,6 +194,12 @@ is_outstanding_tex_or_prefetch(struct ir3_instruction *instr, struct ir3_sched_c
if (!is_tex_or_prefetch(instr))
return false;
/* The sched node is only valid within the same block, we cannot
* really say anything about src's from other blocks
*/
if (instr->block != ctx->block)
return true;
struct ir3_sched_node *n = instr->data;
return n->tex_index >= ctx->first_outstanding_tex_index;
}
@ -204,6 +210,12 @@ is_outstanding_sfu(struct ir3_instruction *instr, struct ir3_sched_ctx *ctx)
if (!is_sfu(instr))
return false;
/* The sched node is only valid within the same block, we cannot
* really say anything about src's from other blocks
*/
if (instr->block != ctx->block)
return true;
struct ir3_sched_node *n = instr->data;
return n->sfu_index >= ctx->first_outstanding_sfu_index;
}