x86: bpf_jit: fix compilation of large bpf programs

[cascardo/linux.git] / arch / x86 / net / bpf_jit_comp.c

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 99f7610..ddeff48 100644 (file)
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -966,7 +966,12 @@ void bpf_int_jit_compile(struct bpf_prog *prog)
        }
        ctx.cleanup_addr = proglen;
 
-       for (pass = 0; pass < 10; pass++) {
+       /* JITed image shrinks with every pass and the loop iterates
+        * until the image stops shrinking. Very large bpf programs
+        * may converge on the last pass. In such case do one more
+        * pass to emit the final image
+        */
+       for (pass = 0; pass < 10 || image; pass++) {
                proglen = do_jit(prog, addrs, image, oldproglen, &ctx);
                if (proglen <= 0) {
                        image = NULL;