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Johannes Berg 0bbab5f030 cfg80211: fix debugfs rename crash 
Removing the "if (IS_ERR(dir)) dir = NULL;" check only works
if we adjust the remaining code to not rely on it being NULL.
Check IS_ERR_OR_NULL() before attempting to dereference it.

I'm not actually entirely sure this fixes the syzbot crash as
the kernel config indicates that they do have DEBUG_FS in the
kernel, but this is what I found when looking there.

Cc: stable@vger.kernel.org
Fixes: d82574a8e5 ("cfg80211: no need to check return value of debugfs_create functions")
Reported-by: syzbot+fd5332e429401bf42d18@syzkaller.appspotmail.com
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20200525113816.fc4da3ec3d4b.Ica63a110679819eaa9fb3bc1b7437d96b1fd187d@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
 		2020-05-25 13:12:32 +02:00
..
certs cfg80211: ship certificates as hex files 2017-12-19 09:28:01 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kconfig lib80211: use crypto API ccm(aes) transform for CCMP processing 2019-07-26 13:22:47 +02:00
Makefile wireless: Skip directory when generating certificates 2019-05-14 10:27:57 +02:00
ap.c cfg80211: call disconnect_wk when AP stops 2019-02-01 11:12:50 +01:00
chan.c nl80211: Disallow setting of HT for channel 14 2019-10-30 10:07:22 +01:00
core.c cfg80211: fix debugfs rename crash 2020-05-25 13:12:32 +02:00
core.h cfg80211/mac80211: Allow user space to register for station Rx authentication 2020-02-07 12:54:09 +01:00
debugfs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
debugfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ethtool.c cfg80211: check wiphy driver existence for drvinfo report 2020-02-07 12:53:26 +01:00
ibss.c cfg80211: ibss: use 11a mandatory rates for 6GHz band operation 2019-08-21 10:54:57 +02:00
lib80211.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
lib80211_crypt_ccmp.c lib80211: use crypto API ccm(aes) transform for CCMP processing 2019-07-26 13:22:47 +02:00
lib80211_crypt_tkip.c Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-07-08 20:57:08 -07:00
lib80211_crypt_wep.c Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-07-08 20:57:08 -07:00
mesh.c nl80211: Add SOCKET_OWNER support to JOIN_MESH 2018-03-29 10:38:24 +02:00
mlme.c cfg80211/mac80211: Allow user space to register for station Rx authentication 2020-02-07 12:54:09 +01:00
nl80211.c nl80211: fix NL80211_ATTR_FTM_RESPONDER policy 2020-04-14 12:28:48 +02:00
nl80211.h cfg80211: Report Association Request frame IEs in association events 2019-02-22 13:35:09 +01:00
ocb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
of.c cfg80211: support ieee80211-freq-limit DT property 2017-01-06 14:01:13 +01:00
pmsr.c nl80211/cfg80211: add support for non EDCA based ranging measurement 2020-03-20 14:42:19 +01:00
radiotap.c cfg80211: add radiotap VHT info to rtap_namespace_sizes 2016-02-24 09:04:41 +01:00
rdev-ops.h nl80211: modify TID-config API 2020-02-24 12:01:10 +01:00
reg.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-02-27 18:31:39 -08:00
reg.h net: Fix various misspellings of "connect" 2019-10-28 13:41:59 -07:00
scan.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2020-03-29 21:25:29 -07:00
sme.c cfg80211: Support key configuration for Beacon protection (BIGTK) 2020-02-24 10:35:48 +01:00
sysfs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 432 2019-06-05 17:37:16 +02:00
sysfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.c
…
trace.h nl80211: modify TID-config API 2020-02-24 12:01:10 +01:00
util.c A new set of changes: 2020-02-24 15:41:54 -08:00
wext-compat.c cfg80211: initialize on-stack chandefs 2019-10-01 17:56:18 +02:00
wext-compat.h treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
wext-core.c wireless: wext: avoid gcc -O3 warning 2020-01-15 09:52:20 +01:00
wext-priv.c
…
wext-proc.c proc: introduce proc_create_net{,_data} 2018-05-16 07:24:30 +02:00
wext-sme.c cfg80211: wext: avoid copying malformed SSIDs 2019-10-04 14:04:08 +02:00
wext-spy.c
…