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-rw-r--r--src/stdio/setbuf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stdio/setbuf.c b/src/stdio/setbuf.c
index ddf38856..38072548 100644
--- a/src/stdio/setbuf.c
+++ b/src/stdio/setbuf.c
@@ -8,6 +8,7 @@ void setbuf(FILE * restrict stream, char * restrict buf)
SIGNAL_SAFE(0);
if (buf) {
+ ASSERT_NOOVERLAP(stream, sizeof(*stream), buf, BUFSIZ);
setvbuf(stream, buf, _IOFBF, BUFSIZ);
} else {
setvbuf(stream, NULL, _IONBF, 0);