ltrace: Fix build on ppc64 with gcc12

gcc-12 has a better static analyser and finds additional use-after-free
case, addressed by removing the double free

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/ltrace/ltrace/0001-ppc-plt-do-not-free-symbol-libsym.patch

@@ -0,0 +1,29 @@
+From f47672bed5905ae382e80b09dafca9a8da45aa67 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 19 Apr 2022 18:44:36 -0700
+Subject: [PATCH] ppc/plt: do not free symbol libsym
+
+delete_symbol_chain() will call free as well if sybol is non-null
+it also fixes use-after-free warnings that compiler emits
+
+Upstream-Status: Submitted [https://gitlab.com/cespedes/ltrace/-/merge_requests/2]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ sysdeps/linux-gnu/ppc/plt.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/sysdeps/linux-gnu/ppc/plt.c b/sysdeps/linux-gnu/ppc/plt.c
+index 5f81889..7c1c025 100644
+--- a/sysdeps/linux-gnu/ppc/plt.c
++++ b/sysdeps/linux-gnu/ppc/plt.c
+@@ -687,7 +687,6 @@ arch_elf_add_func_entry(struct process *proc, struct ltelf *lte,
+ 		if (libsym == NULL
+ 		    || library_symbol_init(libsym, addr, full_name, 1,
+ 					   LS_TOPLT_NONE) < 0) {
+-			free(libsym);
+ 			delete_symbol_chain(libsym);
+ 			libsym = NULL;
+ 			fprintf(stderr, "Couldn't add symbol %s"
+-- 
+2.36.0
+

meta-oe/recipes-devtools/ltrace/ltrace_git.bb

@@ -30,6 +30,7 @@ SRC_URI = "git://github.com/sparkleholic/ltrace.git;branch=master;protocol=http;
            file://0001-ensure-the-struct-pointers-are-null-initilized.patch \
            file://0001-ppc-Remove-unused-host_powerpc64-function.patch \
            file://0001-mips-Use-hardcodes-values-for-ABI-syscall-bases.patch \
+           file://0001-ppc-plt-do-not-free-symbol-libsym.patch \
            "
 SRC_URI:append:libc-musl = " file://add_ppc64le.patch"