[UNIKRAFT PATCH v2] lib/ukdebug: uk_asmdumpk(), uk_asmdumpn(): Stop decoding on errors

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Checks for errors that may occur during instruction decoding with
libzydis.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 lib/ukdebug/asmdump.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/ukdebug/asmdump.c b/lib/ukdebug/asmdump.c
index f73b0d65..f860533c 100644
--- a/lib/ukdebug/asmdump.c
+++ b/lib/ukdebug/asmdump.c
@@ -43,7 +43,7 @@
 
 /**
  * Disassemble <num_ins> instructions with zydis starting
- * with instruction at <addr>
+ * with instruction at <instr>
  */
 static int _asmdump(struct out_dev *o,
                   const void *instr, unsigned int count)
@@ -76,7 +76,10 @@ static int _asmdump(struct out_dev *o,
 
        while (count) {
                addr = ((__uptr) instr) + offset;
-               ZydisDecoderDecodeBuffer(&dcr, (const void *) addr, 16, &ins);
+               if (!ZYAN_SUCCESS(ZydisDecoderDecodeBuffer(&dcr,
+                                                          (const void *) addr,
+                                                          16, &ins)))
+                       break;
                ZydisFormatterFormatInstruction(&fmt, &ins, buf, sizeof(buf),
                                                addr);
                ret = outf(o, "%08"__PRIuptr" <+%d>: %hs\n", addr, offset, buf);
-- 
2.20.1