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SubjectRe: [PATCH v2 08/16] objtool: Fix SEGFAULT
On Fri, Sep 02, 2022 at 08:06:28AM +0000, Christophe Leroy wrote:
>
>
> Le 01/09/2022 à 21:20, Peter Zijlstra a écrit :
> > On Mon, Aug 29, 2022 at 11:22:15AM +0530, Sathvika Vasireddy wrote:
> >> From: Christophe Leroy <christophe.leroy@csgroup.eu>
> >>
> >> find_insn() will return NULL in case of failure. Check insn in order
> >> to avoid a kernel Oops for NULL pointer dereference.
> >>
> >> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> >> ---
> >> tools/objtool/check.c | 2 +-
> >> 1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/tools/objtool/check.c b/tools/objtool/check.c
> >> index 91678252a9b6..ed2fdfeb1d9c 100644
> >> --- a/tools/objtool/check.c
> >> +++ b/tools/objtool/check.c
> >> @@ -205,7 +205,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
> >> return false;
> >>
> >> insn = find_insn(file, func->sec, func->offset);
> >> - if (!insn->func)
> >> + if (!insn || !insn->func)
> >> return false;
> >
> > I suppose this is ok, but how can the lookup for func->sec, func->offset
> > *not* find an instruction ?!
>
> That happened to me at the begining when the port to powerpc was not
> fully functionnal.
>
> I guess that could also happen with a corrupted object file so better
> safe than sorry.

Fair enough.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

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