FS-Cache: fix dereference of NULL user_key_payload

2017-11-06T14:27:10+00:00

commit d124b2c53c7bee6569d2a2d0b18b4a1afde00134 upstream. When the file /proc/fs/fscache/objects (available with CONFIG_FSCACHE_OBJECT_LIST=y) is opened, we request a user key with description "fscache:objlist", then access its payload. However, a revoked key has a NULL payload, and we failed to check for this. request_key() *does* skip revoked keys, but there is still a window where the key can be revoked before we access its payload. Fix it by checking for a NULL payload, treating it like a key which was already revoked at the time it was requested. Fixes: 4fbf4291aa15 ("FS-Cache: Allow the current state of all objects to be dumped") Reviewed-by: James Morris Cc: [v2.6.32+] Signed-off-by: Eric Biggers Signed-off-by: David Howells Signed-off-by: Willy Tarreau

first commit

2016-08-15T02:19:42+00:00

xavi/android_kernel_m2note/fs/fscache/object-list.c, branch ng-7.1.2

FS-Cache: fix dereference of NULL user_key_payload

first commit