This is the 5.4.1 stable release

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Merge 5.4.1 into android-5.4

Changes in 5.4.1
	Bluetooth: Fix invalid-free in bcsp_close()
	ath9k_hw: fix uninitialized variable data
	ath10k: Fix a NULL-ptr-deref bug in ath10k_usb_alloc_urb_from_pipe
	ath10k: Fix HOST capability QMI incompatibility
	ath10k: restore QCA9880-AR1A (v1) detection
	Revert "Bluetooth: hci_ll: set operational frequency earlier"
	Revert "dm crypt: use WQ_HIGHPRI for the IO and crypt workqueues"
	md/raid10: prevent access of uninitialized resync_pages offset
	x86/insn: Fix awk regexp warnings
	x86/speculation: Fix incorrect MDS/TAA mitigation status
	x86/speculation: Fix redundant MDS mitigation message
	nbd: prevent memory leak
	x86/stackframe/32: Repair 32-bit Xen PV
	x86/xen/32: Make xen_iret_crit_fixup() independent of frame layout
	x86/xen/32: Simplify ring check in xen_iret_crit_fixup()
	x86/doublefault/32: Fix stack canaries in the double fault handler
	x86/pti/32: Size initial_page_table correctly
	x86/cpu_entry_area: Add guard page for entry stack on 32bit
	x86/entry/32: Fix IRET exception
	x86/entry/32: Use %ss segment where required
	x86/entry/32: Move FIXUP_FRAME after pushing %fs in SAVE_ALL
	x86/entry/32: Unwind the ESPFIX stack earlier on exception entry
	x86/entry/32: Fix NMI vs ESPFIX
	selftests/x86/mov_ss_trap: Fix the SYSENTER test
	selftests/x86/sigreturn/32: Invalidate DS and ES when abusing the kernel
	x86/pti/32: Calculate the various PTI cpu_entry_area sizes correctly, make the CPU_ENTRY_AREA_PAGES assert precise
	x86/entry/32: Fix FIXUP_ESPFIX_STACK with user CR3
	futex: Prevent robust futex exit race
	ALSA: usb-audio: Fix NULL dereference at parsing BADD
	ALSA: usb-audio: Fix Scarlett 6i6 Gen 2 port data
	media: vivid: Set vid_cap_streaming and vid_out_streaming to true
	media: vivid: Fix wrong locking that causes race conditions on streaming stop
	media: usbvision: Fix invalid accesses after device disconnect
	media: usbvision: Fix races among open, close, and disconnect
	cpufreq: Add NULL checks to show() and store() methods of cpufreq
	futex: Move futex exit handling into futex code
	futex: Replace PF_EXITPIDONE with a state
	exit/exec: Seperate mm_release()
	futex: Split futex_mm_release() for exit/exec
	futex: Set task::futex_state to DEAD right after handling futex exit
	futex: Mark the begin of futex exit explicitly
	futex: Sanitize exit state handling
	futex: Provide state handling for exec() as well
	futex: Add mutex around futex exit
	futex: Provide distinct return value when owner is exiting
	futex: Prevent exit livelock
	media: uvcvideo: Fix error path in control parsing failure
	media: b2c2-flexcop-usb: add sanity checking
	media: cxusb: detect cxusb_ctrl_msg error in query
	media: imon: invalid dereference in imon_touch_event
	media: mceusb: fix out of bounds read in MCE receiver buffer
	ALSA: hda - Disable audio component for legacy Nvidia HDMI codecs
	USBIP: add config dependency for SGL_ALLOC
	usbip: tools: fix fd leakage in the function of read_attr_usbip_status
	usbip: Fix uninitialized symbol 'nents' in stub_recv_cmd_submit()
	usb-serial: cp201x: support Mark-10 digital force gauge
	USB: chaoskey: fix error case of a timeout
	appledisplay: fix error handling in the scheduled work
	USB: serial: mos7840: add USB ID to support Moxa UPort 2210
	USB: serial: mos7720: fix remote wakeup
	USB: serial: mos7840: fix remote wakeup
	USB: serial: option: add support for DW5821e with eSIM support
	USB: serial: option: add support for Foxconn T77W968 LTE modules
	staging: comedi: usbduxfast: usbduxfast_ai_cmdtest rounding error
	powerpc/book3s64: Fix link stack flush on context switch
	KVM: PPC: Book3S HV: Flush link stack on guest exit to host kernel
	Linux 5.4.1

Signed-off-by: Greg Kroah-Hartman <[email protected]>
Change-Id: Id50109953b5638956d150e4fc648a94b6e347fb5

drivers/cpufreq/cpufreq.c

@@ -941,6 +941,9 @@ static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
 	struct freq_attr *fattr = to_attr(attr);
 	ssize_t ret;
 
+	if (!fattr->show)
+		return -EIO;
+
 	down_read(&policy->rwsem);
 	ret = fattr->show(policy, buf);
 	up_read(&policy->rwsem);
@@ -955,6 +958,9 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr,
 	struct freq_attr *fattr = to_attr(attr);
 	ssize_t ret = -EINVAL;
 
+	if (!fattr->store)
+		return -EIO;
+
 	/*
 	 * cpus_read_trylock() is used here to work around a circular lock
 	 * dependency problem with respect to the cpufreq_register_driver().