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[PATCH] monitor: fix memory leak in monitor_fdset_dup_fd_find_remove

kuhn.chenqun@huawei.com posted 1 patch 4 years, 3 months ago
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git fetch https://github.com/patchew-project/qemu tags/patchew/20200115072016.167252-1-kuhn.chenqun@huawei.com
Maintainers: Markus Armbruster <armbru@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>
monitor/misc.c | 1 +
1 file changed, 1 insertion(+)
[PATCH] monitor: fix memory leak in monitor_fdset_dup_fd_find_remove
Posted by kuhn.chenqun@huawei.com 4 years, 3 months ago 
From: Chen Qun <kuhn.chenqun@huawei.com>

When remove dup_fd in monitor_fdset_dup_fd_find_remove function,
we need to free mon_fdset_fd_dup. ASAN shows memory leak stack:

Direct leak of 96 byte(s) in 3 object(s) allocated from:
    #0 0xfffd37b033b3 in __interceptor_calloc (/lib64/libasan.so.4+0xd33b3)
    #1 0xfffd375c71cb in g_malloc0 (/lib64/libglib-2.0.so.0+0x571cb)
    #2 0xaaae25bf1c17 in monitor_fdset_dup_fd_add /qemu/monitor/misc.c:1724
    #3 0xaaae265cfd8f in qemu_open /qemu/util/osdep.c:315
    #4 0xaaae264e2b2b in qmp_chardev_open_file_source /qemu/chardev/char-fd.c:122
    #5 0xaaae264e47cf in qmp_chardev_open_file /qemu/chardev/char-file.c:81
    #6 0xaaae264e118b in qemu_char_open /qemu/chardev/char.c:237
    #7 0xaaae264e118b in qemu_chardev_new /qemu/chardev/char.c:964
    #8 0xaaae264e1543 in qemu_chr_new_from_opts /qemu/chardev/char.c:680
    #9 0xaaae25e12e0f in chardev_init_func /qemu/vl.c:2083
    #10 0xaaae26603823 in qemu_opts_foreach /qemu/util/qemu-option.c:1170
    #11 0xaaae258c9787 in main /qemu/vl.c:4089
    #12 0xfffd35b80b9f in __libc_start_main (/lib64/libc.so.6+0x20b9f)
    #13 0xaaae258d7b63  (/qemu/build/aarch64-softmmu/qemu-system-aarch64+0x8b7b63)

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
---
 monitor/misc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/monitor/misc.c b/monitor/misc.c
index a04d7edde0..cf79d36100 100644
--- a/monitor/misc.c
+++ b/monitor/misc.c
@@ -1744,6 +1744,7 @@ static int64_t monitor_fdset_dup_fd_find_remove(int dup_fd, bool remove)
             if (mon_fdset_fd_dup->fd == dup_fd) {
                 if (remove) {
                     QLIST_REMOVE(mon_fdset_fd_dup, next);
+                    g_free(mon_fdset_fd_dup);
                     if (QLIST_EMPTY(&mon_fdset->dup_fds)) {
                         monitor_fdset_cleanup(mon_fdset);
                     }
-- 
2.23.0
Re: [PATCH] monitor: fix memory leak in monitor_fdset_dup_fd_find_remove
Posted by Marc-André Lureau 4 years, 3 months ago 
On Wed, Jan 15, 2020 at 11:21 AM <kuhn.chenqun@huawei.com> wrote:
>
> From: Chen Qun <kuhn.chenqun@huawei.com>
>
> When remove dup_fd in monitor_fdset_dup_fd_find_remove function,
> we need to free mon_fdset_fd_dup. ASAN shows memory leak stack:
>
> Direct leak of 96 byte(s) in 3 object(s) allocated from:
>     #0 0xfffd37b033b3 in __interceptor_calloc (/lib64/libasan.so.4+0xd33b3)
>     #1 0xfffd375c71cb in g_malloc0 (/lib64/libglib-2.0.so.0+0x571cb)
>     #2 0xaaae25bf1c17 in monitor_fdset_dup_fd_add /qemu/monitor/misc.c:1724
>     #3 0xaaae265cfd8f in qemu_open /qemu/util/osdep.c:315
>     #4 0xaaae264e2b2b in qmp_chardev_open_file_source /qemu/chardev/char-fd.c:122
>     #5 0xaaae264e47cf in qmp_chardev_open_file /qemu/chardev/char-file.c:81
>     #6 0xaaae264e118b in qemu_char_open /qemu/chardev/char.c:237
>     #7 0xaaae264e118b in qemu_chardev_new /qemu/chardev/char.c:964
>     #8 0xaaae264e1543 in qemu_chr_new_from_opts /qemu/chardev/char.c:680
>     #9 0xaaae25e12e0f in chardev_init_func /qemu/vl.c:2083
>     #10 0xaaae26603823 in qemu_opts_foreach /qemu/util/qemu-option.c:1170
>     #11 0xaaae258c9787 in main /qemu/vl.c:4089
>     #12 0xfffd35b80b9f in __libc_start_main (/lib64/libc.so.6+0x20b9f)
>     #13 0xaaae258d7b63  (/qemu/build/aarch64-softmmu/qemu-system-aarch64+0x8b7b63)
>
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>


> ---
>  monitor/misc.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/monitor/misc.c b/monitor/misc.c
> index a04d7edde0..cf79d36100 100644
> --- a/monitor/misc.c
> +++ b/monitor/misc.c
> @@ -1744,6 +1744,7 @@ static int64_t monitor_fdset_dup_fd_find_remove(int dup_fd, bool remove)
>              if (mon_fdset_fd_dup->fd == dup_fd) {
>                  if (remove) {
>                      QLIST_REMOVE(mon_fdset_fd_dup, next);
> +                    g_free(mon_fdset_fd_dup);
>                      if (QLIST_EMPTY(&mon_fdset->dup_fds)) {
>                          monitor_fdset_cleanup(mon_fdset);
>                      }
> --
> 2.23.0
>
>
>


-- 
Marc-André Lureau
Re: [PATCH] monitor: fix memory leak in monitor_fdset_dup_fd_find_remove
Posted by Laurent Vivier 4 years, 2 months ago 
Le 15/01/2020 à 08:20, kuhn.chenqun@huawei.com a écrit :
> From: Chen Qun <kuhn.chenqun@huawei.com>
> 
> When remove dup_fd in monitor_fdset_dup_fd_find_remove function,
> we need to free mon_fdset_fd_dup. ASAN shows memory leak stack:
> 
> Direct leak of 96 byte(s) in 3 object(s) allocated from:
>     #0 0xfffd37b033b3 in __interceptor_calloc (/lib64/libasan.so.4+0xd33b3)
>     #1 0xfffd375c71cb in g_malloc0 (/lib64/libglib-2.0.so.0+0x571cb)
>     #2 0xaaae25bf1c17 in monitor_fdset_dup_fd_add /qemu/monitor/misc.c:1724
>     #3 0xaaae265cfd8f in qemu_open /qemu/util/osdep.c:315
>     #4 0xaaae264e2b2b in qmp_chardev_open_file_source /qemu/chardev/char-fd.c:122
>     #5 0xaaae264e47cf in qmp_chardev_open_file /qemu/chardev/char-file.c:81
>     #6 0xaaae264e118b in qemu_char_open /qemu/chardev/char.c:237
>     #7 0xaaae264e118b in qemu_chardev_new /qemu/chardev/char.c:964
>     #8 0xaaae264e1543 in qemu_chr_new_from_opts /qemu/chardev/char.c:680
>     #9 0xaaae25e12e0f in chardev_init_func /qemu/vl.c:2083
>     #10 0xaaae26603823 in qemu_opts_foreach /qemu/util/qemu-option.c:1170
>     #11 0xaaae258c9787 in main /qemu/vl.c:4089
>     #12 0xfffd35b80b9f in __libc_start_main (/lib64/libc.so.6+0x20b9f)
>     #13 0xaaae258d7b63  (/qemu/build/aarch64-softmmu/qemu-system-aarch64+0x8b7b63)
> 
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
> ---
>  monitor/misc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/monitor/misc.c b/monitor/misc.c
> index a04d7edde0..cf79d36100 100644
> --- a/monitor/misc.c
> +++ b/monitor/misc.c
> @@ -1744,6 +1744,7 @@ static int64_t monitor_fdset_dup_fd_find_remove(int dup_fd, bool remove)
>              if (mon_fdset_fd_dup->fd == dup_fd) {
>                  if (remove) {
>                      QLIST_REMOVE(mon_fdset_fd_dup, next);
> +                    g_free(mon_fdset_fd_dup);
>                      if (QLIST_EMPTY(&mon_fdset->dup_fds)) {
>                          monitor_fdset_cleanup(mon_fdset);
>                      }
> 

Applied to my trivial-patches branch.

Thanks,
Laurent

Patchew 2.1-devel-0870f84

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