On Thu, 28 Sep 2017, Eric Biggers wrote: > From: Eric Biggers <[email protected]> > > 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") > Cc: <[email protected]> [v2.6.32+] > Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: James Morris <[email protected]> -- James Morris <[email protected]> -- Linux-cachefs mailing list [email protected] https://www.redhat.com/mailman/listinfo/linux-cachefs
