Downstream-only patch from Mark Wielaard <mjw@redhat.com> to avoid a
crash in backtrace if the vDSO is not available.
Upstream, this code was removed in commit 82fd7314c7df8c5555dce02
("powerpc: Remove backtrace implementation"), so patch is not needed
there.
diff --git a/sysdeps/powerpc/powerpc64/backtrace.c b/sysdeps/powerpc/powerpc64/backtrace.c
index 37de9b5bdd73c316..0ffa7509dfa4862a 100644
--- a/sysdeps/powerpc/powerpc64/backtrace.c
+++ b/sysdeps/powerpc/powerpc64/backtrace.c
@@ -68,8 +68,9 @@ static inline bool
is_sigtramp_address (void *nip)
{
#ifdef HAVE_SIGTRAMP_RT64
- if (nip == GLRO (dl_vdso_sigtramp_rt64) ||
- nip == GLRO (dl_vdso_sigtramp_rt64) + 4)
+ if ((nip == GLRO (dl_vdso_sigtramp_rt64) ||
+ nip == GLRO (dl_vdso_sigtramp_rt64) + 4)
+ && nip != NULL)
return true;
#endif
return false;