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[COMMITTED] bpf: avoid potential NULL pointer dereference

Message ID 20211208184920.12048-1-david.faust@oracle.com
State New
Headers show
Series [COMMITTED] bpf: avoid potential NULL pointer dereference | expand

Commit Message

David Faust Dec. 8, 2021, 6:49 p.m. UTC 
[Committed as obvious.]

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.
---
 gcc/config/bpf/bpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

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);
 		    }