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* [gcc r12-5843] bpf: avoid potential NULL pointer dereference
@ 2021-12-08 18:48 David Faust
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From: David Faust @ 2021-12-08 18:48 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:e4c2b55b4cefc574a4c2b0b06928220edb9b3f2c
commit r12-5843-ge4c2b55b4cefc574a4c2b0b06928220edb9b3f2c
Author: David Faust <david.faust@oracle.com>
Date: Tue Dec 7 11:45:48 2021 -0800
bpf: avoid potential NULL pointer dereference
If the result from SSA_NAME_DEF_STMT is NULL, we could try to
dereference it anyway and ICE. Avoid this.
gcc/ChangeLog:
* config/bpf/bpf.c (handle_attr_preserve): Avoid calling
is_gimple_assign with a NULL pointer.
Diff:
---
gcc/config/bpf/bpf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/config/bpf/bpf.c b/gcc/config/bpf/bpf.c
index 9d2c0bb6818..c054c1ead6b 100644
--- a/gcc/config/bpf/bpf.c
+++ b/gcc/config/bpf/bpf.c
@@ -1482,7 +1482,7 @@ handle_attr_preserve (function *fn)
&& TREE_CODE (TREE_OPERAND (expr, 0)) == SSA_NAME)
{
gimple *def_stmt = SSA_NAME_DEF_STMT (TREE_OPERAND (expr, 0));
- if (is_gimple_assign (def_stmt))
+ if (def_stmt && is_gimple_assign (def_stmt))
expr = gimple_assign_rhs1 (def_stmt);
}
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