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-rw-r--r--src/vppinfra/string.h14
1 files changed, 12 insertions, 2 deletions
diff --git a/src/vppinfra/string.h b/src/vppinfra/string.h
index a25d461868b..d5686704c22 100644
--- a/src/vppinfra/string.h
+++ b/src/vppinfra/string.h
@@ -1031,10 +1031,20 @@ strncpy_s_inline (char *__restrict__ dest, rsize_t dmax,
low = (uword) (src < dest ? src : dest);
hi = (uword) (src < dest ? dest : src);
+ /*
+ * This check may fail innocently if src + dmax >= dst, but
+ * src + strlen(src) < dst. If it fails, check more carefully before
+ * blowing the whistle.
+ */
if (PREDICT_FALSE (low + (m - 1) >= hi))
{
- clib_c11_violation ("src/dest overlap");
- return EINVAL;
+ m = clib_strnlen (src, m);
+
+ if (low + (m - 1) >= hi)
+ {
+ clib_c11_violation ("src/dest overlap");
+ return EINVAL;
+ }
}
clib_memcpy_fast (dest, src, m);