[PATCH kdumpid 3/3] Gracefully handle missing dissasembler function

[Stephen Brennan <stephen.s.brennan@oracle.com>]

If disassembler() returns NULL then kdumpid is guaranteed to segfault.
Gracefully return a 0 so we can continue on.

Signed-off-by: Stephen Brennan <stephen.s.brennan@oracle.com>
---
 ppc.c   | 2 ++
 ppc64.c | 2 ++
 s390.c  | 2 ++
 x86.c   | 2 ++
 4 files changed, 8 insertions(+)

diff --git a/ppc.c b/ppc.c
index 8d460ae..3683381 100644
--- a/ppc.c
+++ b/ppc.c
@@ -155,5 +155,7 @@ looks_like_kcode_ppc(struct dump_desc *dd, uint64_t addr)
 	print_insn = disassembler(bfd_arch_powerpc,
 				  dd->endian != KDUMP_LITTLE_ENDIAN,
 				  bfd_mach_ppc, NULL);
+	if (!print_insn)
+		return 0;
 	return disas_at(dd, &info, 0);
 }
diff --git a/ppc64.c b/ppc64.c
index 67a912f..fbfb728 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -171,5 +171,7 @@ looks_like_kcode_ppc64(struct dump_desc *dd, uint64_t addr)
 	print_insn = disassembler(bfd_arch_powerpc,
 				  dd->endian != KDUMP_LITTLE_ENDIAN,
 				  bfd_mach_ppc64, NULL);
+	if (!print_insn)
+		return 0;
 	return disas_at(dd, &info, 0);
 }
diff --git a/s390.c b/s390.c
index fdd23f7..68c8e5d 100644
--- a/s390.c
+++ b/s390.c
@@ -159,6 +159,8 @@ looks_like_kcode_s390(struct dump_desc *dd, uint64_t addr)
 	disassemble_init_for_target(&info);
 	print_insn = disassembler(bfd_arch_s390, TRUE,
 				  bfd_mach_s390_64, NULL);
+	if (!print_insn)
+		return 0;
 	ret |= disas_at(dd, &info, 0);
 
 	if (ret > 0 && priv.state.flags & SAM64_SEEN)
diff --git a/x86.c b/x86.c
index 5c72bbb..5e35778 100644
--- a/x86.c
+++ b/x86.c
@@ -289,6 +289,7 @@ looks_like_kcode_x86(struct dump_desc *dd, uint64_t addr)
 	print_insn = disassembler(bfd_arch_i386, FALSE,
 				  bfd_mach_i386_i386, NULL);
 	if ((!dd->arch || strcmp(dd->arch, "x86_64")) &&
+	    print_insn &&
 	    disas_at(dd, &info, 0) > 0) {
 		free(priv);
 		return 1;
@@ -301,6 +302,7 @@ looks_like_kcode_x86(struct dump_desc *dd, uint64_t addr)
 	print_insn = disassembler(bfd_arch_i386, FALSE,
 				  bfd_mach_x86_64, NULL);
 	if ((!dd->arch || strcmp(dd->arch, "i386")) &&
+	    print_insn &&
 	    disas_at(dd, &info, 0) > 0) {
 		free(priv);
 		return 1;
-- 
2.39.2