Hello David Howells,
This is a semi-automatic email about new static checker warnings.
The patch a5b3a80b899b: "CacheFiles: Provide read-and-reset release
counters for cachefilesd" from Feb 1, 2016, leads to the following
Smatch complaint:
fs/cachefiles/interface.c:295 cachefiles_drop_object()
error: we previously assumed 'object->dentry' could be null (see line 276)
fs/cachefiles/interface.c
275 */
276 if (object->dentry) {
^^^^^^^^^^^^^^
Check for NULL.
277 /* delete retired objects */
278 if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
279 _object != cache->cache.fsdef
280 ) {
281 _debug("- retire object OBJ%x", object->fscache.debug_id);
282 cachefiles_begin_secure(cache, &saved_cred);
283 cachefiles_delete_object(cache, object);
284 cachefiles_end_secure(cache, saved_cred);
285 }
286
287 /* close the filesystem stuff attached to the object */
288 if (object->backer != object->dentry)
289 dput(object->backer);
290 object->backer = NULL;
291 }
292
293 /* note that the object is now inactive */
294 if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags))
295 cachefiles_mark_object_inactive(cache, object);
^^^^^^
Unchecked dereference inside the function. Perhaps CACHEFILES_OBJECT_ACTIVE
implies it's non-NULL but it would probably easier to read if we moved
it inside the above if statement.
296
297 dput(object->dentry);
regards,
dan carpenter
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