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-rw-r--r--strings/strmov.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/strings/strmov.c b/strings/strmov.c
index b38d5db5d6e..0f594185688 100644
--- a/strings/strmov.c
+++ b/strings/strmov.c
@@ -40,6 +40,7 @@
char *strmov(register char *dst, register const char *src)
{
+ DBUG_ASSERT(src + strlen(src) < dst || dst + strlen(src) < src);
while ((*dst++ = *src++)) ;
return dst-1;
}