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objtool: Fix segfault in ignore_unreachable_insn()

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[ Upstream commit 69d41d6daf ]

Check 'prev_insn' before dereferencing it.

Fixes: bd841d6154 ("objtool: Fix CONFIG_UBSAN_TRAP unreachable warnings")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/5df4ff89c9e4b9e788b77b0531234ffa7ba03e9e.1743136205.git.jpoimboe@kernel.org

Closes: https://lore.kernel.org/d86b4cc6-0b97-4095-8793-a7384410b8ab@app.fastmail.com
Closes: https://lore.kernel.org/Z-V_rruKY0-36pqA@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Josh Poimboeuf
2025-03-27 22:04:21 -07:00
committed by Greg Kroah-Hartman
parent de37b82be6
commit 8f77c286d5
1 changed files with 1 additions and 1 deletions
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tools/objtool/check.c
+1 -1
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@@ -4089,7 +4089,7 @@ static bool ignore_unreachable_insn(struct objtool_file *file, struct instructio
* It may also insert a UD2 after calling a __noreturn function.
*/
prev_insn = prev_insn_same_sec(file, insn);
if (prev_insn->dead_end &&
if (prev_insn && prev_insn->dead_end &&
(insn->type == INSN_BUG ||
(insn->type == INSN_JUMP_UNCONDITIONAL &&
insn->jump_dest && insn->jump_dest->type == INSN_BUG)))