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objtool: Fix SEGFAULT

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[ Upstream commit efb11fdb3e1a9f694fa12b70b21e69e55ec59c36 ]

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@linux.vnet.ibm.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221114175754.1131267-9-sv@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christophe Leroy 2022-11-14 23:27:46 +05:30 committed by Greg Kroah-Hartman
parent 28046827c3
commit 418ef921cc
1 changed files with 1 additions and 1 deletions
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tools/objtool/check.c
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@ -162,7 +162,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
return false; return false;
insn = find_insn(file, func->sec, func->offset); insn = find_insn(file, func->sec, func->offset);
if (!insn->func) if (!insn || !insn->func)
return false; return false;
func_for_each_insn_all(file, func, insn) { func_for_each_insn_all(file, func, insn) {