[PATCH v5 08/16] objtool: Fix SEGFAULT

From: Sathvika Vasireddy
Date: Fri Oct 28 2022 - 10:35:42 EST


From: Christophe Leroy <christophe.leroy@xxxxxxxxxx>

find_insn() will return NULL in case of failure. Check insn in order
to avoid a kernel Oops for NULL pointer dereference.

Tested-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
tools/objtool/check.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 43ec14c29a60..8427af808221 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -207,7 +207,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
return false;

insn = find_insn(file, func->sec, func->offset);
- if (!insn->func)
+ if (!insn || !insn->func)
return false;

func_for_each_insn(file, func, insn) {
--
2.31.1