[v2,2/4] Fix off-by-one OOB write in iconv/tst-iconv-mt

Message ID f2035cada9c469a5014afbd22070554340eeefea.1666974807.git.szabolcs.nagy@arm.com
State New
Headers
Series patches from the morello port |

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent

Commit Message

Szabolcs Nagy Oct. 28, 2022, 4:40 p.m. UTC
  The iconv buffer sizes must not include the \0 string terminator.
And the output termination with *outbufpos = '\0' was OOB.

Consistently use non-null-terminated buffer sizes.

---
v2: dropped \0 and replaced strncmp with TEST_COMPARE_BLOB.
---
 iconv/tst-iconv-mt.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)
  

Patch

diff --git a/iconv/tst-iconv-mt.c b/iconv/tst-iconv-mt.c
index daaebd273b..36afd8aed4 100644
--- a/iconv/tst-iconv-mt.c
+++ b/iconv/tst-iconv-mt.c
@@ -57,12 +57,13 @@  worker (void * arg)
   iconv_t cd;
 
   char ascii[] = CONV_INPUT;
+  size_t bytes = sizeof (CONV_INPUT) - 1;
   char *inbufpos = ascii;
-  size_t inbytesleft = sizeof (CONV_INPUT);
+  size_t inbytesleft = bytes;
 
-  char *utf8 = xcalloc (sizeof (CONV_INPUT), 1);
+  char *utf8 = xcalloc (bytes, 1);
   char *outbufpos = utf8;
-  size_t outbytesleft = sizeof (CONV_INPUT);
+  size_t outbytesleft = bytes;
 
   if (tidx < TCOUNT/2)
     /* The first half of the worker thread pool synchronize together here,
@@ -91,8 +92,6 @@  worker (void * arg)
                            &outbytesleft)
                     != (size_t) -1);
 
-  *outbufpos = '\0';
-
   xpthread_barrier_wait (&sync);
 
   TEST_VERIFY_EXIT (iconv_close (cd) == 0);
@@ -104,11 +103,7 @@  worker (void * arg)
   if (tidx < TCOUNT/2)
     xpthread_barrier_wait (&sync);
 
-  if (strncmp (utf8, CONV_INPUT, sizeof CONV_INPUT))
-    {
-      printf ("FAIL: thread %lx: invalid conversion output from iconv\n", tidx);
-      pthread_exit ((void *) (long int) 1);
-    }
+  TEST_COMPARE_BLOB (utf8, bytes, CONV_INPUT, bytes);
 
   pthread_exit (NULL);
 }