fix twos complement overflow bug in mem streams boundary check

[musl] / src / stdio / open_memstream.c

diff --git a/src/stdio/open_memstream.c b/src/stdio/open_memstream.c
index 2f3569f..5773709 100644 (file)
--- a/src/stdio/open_memstream.c
+++ b/src/stdio/open_memstream.c
@@ -28,7 +28,7 @@ static off_t ms_seek(FILE *f, off_t off, int whence)
                errno = EINVAL;
                return -1;
        }
-       if (-off > base || off > SSIZE_MAX-base) goto fail;
+       if (off < -base || off > SSIZE_MAX-base) goto fail;
        return c->pos = base+off;
 }