diff options
author | Josh Poimboeuf <jpoimboe@redhat.com> | 2018-02-08 17:09:25 -0600 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2018-02-15 01:15:49 +0100 |
commit | fe24e27128252c230a34a6c628da2bf1676781ea (patch) | |
tree | ffea8f7a177d22d4bacc688f6465a5264d55c200 /drivers/dma/fsldma.c | |
parent | 9279ddf23ce78ff2676e8e8e19fec0f022c26d04 (diff) |
objtool: Fix segfault in ignore_unreachable_insn()
Peter Zijlstra's patch for converting WARN() to use UD2 triggered a
bunch of false "unreachable instruction" warnings, which then triggered
a seg fault in ignore_unreachable_insn().
The seg fault happened when it tried to dereference a NULL 'insn->func'
pointer. Thanks to static_cpu_has(), some functions can jump to a
non-function area in the .altinstr_aux section. That breaks
ignore_unreachable_insn()'s assumption that it's always inside the
original function.
Make sure ignore_unreachable_insn() only follows jumps within the
current function.
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kbuild test robot <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/bace77a60d5af9b45eddb8f8fb9c776c8de657ef.1518130694.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/dma/fsldma.c')
0 files changed, 0 insertions, 0 deletions