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objtool: Fix Clang jump table detection

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With Clang, there can be a conditional forward jump between the load of
the jump table address and the indirect branch.

Fixes the following warning:

  vmlinux.o: warning: objtool: ___bpf_prog_run+0x1c5: sibling call from callable instruction with modified stack frame

Reported-by: Arnd Bergmann <arnd@arndb.de>
Closes: https://lore.kernel.org/a426d669-58bb-4be1-9eaa-6f3d83109e2d@app.fastmail.com
Link: https://patch.msgid.link/7d8600caed08901b6679767488acd639f6df9688.1773071992.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf
2026-03-09 09:03:05 -07:00
parent 6f93f7b068
commit 4e50192164
1 changed files with 2 additions and 3 deletions
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5
tools/objtool/check.c
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@@ -2184,12 +2184,11 @@ static void mark_func_jump_tables(struct objtool_file *file,
last = insn;
/*
* Store back-pointers for unconditional forward jumps such
* Store back-pointers for forward jumps such
* that find_jump_table() can back-track using those and
* avoid some potentially confusing code.
*/
if (insn->type == INSN_JUMP_UNCONDITIONAL && insn->jump_dest &&
insn->offset > last->offset &&
if (insn->jump_dest &&
insn->jump_dest->offset > insn->offset &&
!insn->jump_dest->first_jump_src) {