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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-03-28 08:04:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 15:37:35 +0300 |
| commit | 8f77c286d5e0573dcd4bdbf22c3018d625a0c473 (patch) | |
| tree | fb4a1fe783b9c20edec92cefb47c3310a3fe0424 /tools/objtool | |
| parent | de37b82be68d546eea2141434867e3aecaed61eb (diff) | |
| download | linux-8f77c286d5e0573dcd4bdbf22c3018d625a0c473.tar.xz | |
objtool: Fix segfault in ignore_unreachable_insn()
[ Upstream commit 69d41d6dafff0967565b971d950bd10443e4076c ]
Check 'prev_insn' before dereferencing it.
Fixes: bd841d6154f5 ("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>
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/check.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 5824aa68ff96..36412f1881e6 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -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))) |