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| author |   Dan Carpenter <dan.carpenter@oracle.com> | 2015-04-21 16:46:28 +0300 |
|---|---|---|
| committer |   Matt Fleming <matt.fleming@intel.com> | 2015-05-05 16:20:13 +0100 |
| commit | d67e199611b986b345ea3087ee2e4a15da1c98b3 (patch) | |
| tree | 8b405a9337c27c2ae7b64080a88806f88d8c7363 /drivers/firmware | |
| parent | x86/efi: Store upper bits of command line buffer address in ext_cmd_line_ptr (diff) | |
| download | linux-dev-d67e199611b986b345ea3087ee2e4a15da1c98b3.tar.xz linux-dev-d67e199611b986b345ea3087ee2e4a15da1c98b3.zip | |
efi: Fix error handling in add_sysfs_runtime_map_entry()
I spotted two (difficult to hit) bugs while reviewing this.
1) There is a double free bug because we unregister "map_kset" in
add_sysfs_runtime_map_entry() and also efi_runtime_map_init().
2) If we fail to allocate "entry" then we should return
ERR_PTR(-ENOMEM) instead of NULL.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Guangyu Sun <guangyu.sun@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/runtime-map.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/firmware/efi/runtime-map.c b/drivers/firmware/efi/runtime-map.c index 87b8e3b900d2..5c55227a34c8 100644 --- a/drivers/firmware/efi/runtime-map.c +++ b/drivers/firmware/efi/runtime-map.c @@ -120,7 +120,8 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr) entry = kzalloc(sizeof(*entry), GFP_KERNEL); if (!entry) { kset_unregister(map_kset); - return entry; + map_kset = NULL; + return ERR_PTR(-ENOMEM); } memcpy(&entry->md, efi_runtime_map + nr * efi_memdesc_size, @@ -132,6 +133,7 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr) if (ret) { kobject_put(&entry->kobj); kset_unregister(map_kset); + map_kset = NULL; return ERR_PTR(ret); } @@ -195,8 +197,6 @@ out_add_entry: entry = *(map_entries + j); kobject_put(&entry->kobj); } - if (map_kset) - kset_unregister(map_kset); out: return ret; } |