[PULL 33/41] linux-user/elfload: Avoid leaking interp_name using GLib memory API

From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PULL 33/41] linux-user/elfload: Avoid leaking interp_name using GLib memory API
Date: Tue, 20 Oct 2020 16:56:48 +0100	[thread overview]
Message-ID: <20201020155656.8045-34-peter.maydell@linaro.org> (raw)
In-Reply-To: <20201020155656.8045-1-peter.maydell@linaro.org>

From: Philippe Mathieu-Daudé <f4bug@amsat.org>

Fix an unlikely memory leak in load_elf_image().

Fixes: bf858897b7 ("linux-user: Re-use load_elf_image for the main binary.")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20201016184207.786698-5-richard.henderson@linaro.org
Message-Id: <20201003174944.1972444-1-f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/elfload.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index f6022fd7049..1a3150df7c0 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -2584,13 +2584,13 @@ static void load_elf_image(const char *image_name, int image_fd,
                 info->brk = vaddr_em;
             }
         } else if (eppnt->p_type == PT_INTERP && pinterp_name) {
-            char *interp_name;
+            g_autofree char *interp_name = NULL;
 
             if (*pinterp_name) {
                 errmsg = "Multiple PT_INTERP entries";
                 goto exit_errmsg;
             }
-            interp_name = malloc(eppnt->p_filesz);
+            interp_name = g_malloc(eppnt->p_filesz);
             if (!interp_name) {
                 goto exit_perror;
             }
@@ -2609,7 +2609,7 @@ static void load_elf_image(const char *image_name, int image_fd,
                 errmsg = "Invalid PT_INTERP entry";
                 goto exit_errmsg;
             }
-            *pinterp_name = interp_name;
+            *pinterp_name = g_steal_pointer(&interp_name);
 #ifdef TARGET_MIPS
         } else if (eppnt->p_type == PT_MIPS_ABIFLAGS) {
             Mips_elf_abiflags_v0 abiflags;
@@ -2961,7 +2961,7 @@ int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
     if (elf_interpreter) {
         info->load_bias = interp_info.load_bias;
         info->entry = interp_info.entry;
-        free(elf_interpreter);
+        g_free(elf_interpreter);
     }
 
 #ifdef USE_ELF_CORE_DUMP
-- 
2.20.1


