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Message-Id: <20210322133039.4740-1-lyl2019@mail.ustc.edu.cn> Date: Mon, 22 Mar 2021 06:30:39 -0700 From: Lv Yunlong <lyl2019@...l.ustc.edu.cn> To: akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, Lv Yunlong <lyl2019@...l.ustc.edu.cn> Subject: [PATCH] firmware/dmi-sysfs: Fix a double free in dmi_sysfs_register_handle In the case of DMI_ENTRY_SYSTEM_EVENT_LOG, it calls dmi_system_event_log(entry). If dmi_system_event_log() failed, it will free the entry->child and return err. But in the out_err branch, the entry->child will be freed again. My patch adds a new label "out_err1" to avoid freeing entry->child twice. Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn> --- drivers/firmware/dmi-sysfs.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c index 8b8127fa8955..fd498f2037a8 100644 --- a/drivers/firmware/dmi-sysfs.c +++ b/drivers/firmware/dmi-sysfs.c @@ -622,16 +622,17 @@ static void __init dmi_sysfs_register_handle(const struct dmi_header *dh, break; } if (*ret) - goto out_err; + goto out_err1; /* Create the raw binary file to access the entry */ *ret = sysfs_create_bin_file(&entry->kobj, &dmi_entry_raw_attr); if (*ret) - goto out_err; + goto out_err2; return; -out_err: +out_err2: kobject_put(entry->child); +out_err1: kobject_put(&entry->kobj); return; } -- 2.25.1
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