fix the use of syscall result in dl_mmap

diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 206427f..7cb66db 100644 (file)
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -920,7 +920,7 @@ static void *dl_mmap(size_t n)
 #else
        p = (void *)__syscall(SYS_mmap, 0, n, prot, flags, -1, 0);
 #endif
-       return p == MAP_FAILED ? 0 : p;
+       return (unsigned long)p > -4096UL ? 0 : p;
 }
 
 static void makefuncdescs(struct dso *p)