[PATCH] objtool: fix potential memory leak special_get_alts()

[Chen Wandun]

If get_alt_entry() return error, struct special_alt will leak.

Fixes: 442f04c34a1a ("objtool: Add tool to perform compile-time stack metadata 
validation")
Signed-off-by: Chen Wandun <chenwan...@huawei.com>
---
 tools/objtool/special.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index e893f1e48e44..90a6ba2d5895 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c
@@ -188,8 +188,10 @@ int special_get_alts(struct elf *elf, struct list_head 
*alts)
                        memset(alt, 0, sizeof(*alt));
 
                        ret = get_alt_entry(elf, entry, sec, idx, alt);
-                       if (ret)
+                       if (ret) {
+                               free(alt);
                                return ret;
+                       }
 
                        list_add_tail(&alt->list, alts);
                }
-- 
2.17.1