musl: Fix out of bounds data access in dlopen

(From OE-Core rev: c81a204f41bd018964d7ef096087ace5c78365c3)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/musl/musl/out_of_bounds_read.patch

@@ -0,0 +1,20 @@
+Fix out of bounds read
+
+self->dtv hasn't been extended yet
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+diff --git a/ldso/dynlink.c b/ldso/dynlink.c
+index e2c3259f..b23ea0df 100644
+--- a/ldso/dynlink.c
++++ b/ldso/dynlink.c
+@@ -1374,7 +1376,7 @@ static void install_new_tls(void)
+ 	}
+ 	/* Install new dtls into the enlarged, uninstalled dtv copies. */
+ 	for (p=head; ; p=p->next) {
+-		if (!p->tls_id || self->dtv[p->tls_id]) continue;
++		if (p->tls_id <= old_cnt) continue;
+ 		unsigned char *mem = p->new_tls;
+ 		for (j=0; j<i; j++) {
+ 			unsigned char *new = mem;

meta/recipes-core/musl/musl_git.bb

@@ -15,6 +15,7 @@ PV = "${BASEVER}+git${SRCPV}"
 SRC_URI = "git://git.musl-libc.org/musl \
            file://0001-Make-dynamic-linker-a-relative-symlink-to-libc.patch \
            file://0002-ldso-Use-syslibdir-and-libdir-as-default-pathes-to-l.patch \
+           file://out_of_bounds_read.patch \
           "
 
 S = "${WORKDIR}/git"