Linux Kernel 4.19.178 Released

Linux kernel 4.19.178 is a stable release from the 4.19 LTS series, containing 248 patches addressing security fixes, memory leaks, and driver corrections. This release modified approximately 239,909 lines of source code compared to the base 4.19 release.

Device Tree and Architecture Fixes

Several ARM and ARM64 device tree updates improve hardware support and thermal management:

ARM Cortex-A55 erratum 1024718 workaround extended to all versions
ARM64 TLB invalidation now includes proper instruction barriers via ISB after invalidating TLB in __primary_switch
Thermal interrupt configuration added for OMAP 4430
Allwinner A64 MMC2 bus frequency limited to 150 MHz for stability
Samsung Exynos platforms corrected PMIC interrupt trigger levels
ARM Cortex-A55 uprobe probing returns EOPNOTSUPP for AARCH32 instructions

Memory and Buffer Management

Several fixes address potential use-after-free and memory leak conditions:

dm era metadata handling corrected to prevent bitset memory leaks and verify data block size consistency
Hugetlb copy operations fixed to avoid double-free in error paths
JFS potential integer overflow on shift operations corrected
jffs2 use-after-free eliminated in sum_write_data()
Buffer head reference counting fixed in isofs and affs filesystems
Various DMA driver resource leaks plugged in error handling paths

Network and Protocol Fixes

Network stack improvements focus on ICMP handling and device-specific corrections:

ICMP helpers introduced for NAT’d source addresses in network device context
GTP, sunvnet, and xfrm interface drivers now use icmp_ndo_send helper
IPv6 ICMP compilation warning silenced for non-IPV6 builds
TCP SO_RCVLOWAT hangs under memory pressure resolved
BPF fib_lookup helper MTU check corrected for SKB context
amd-xgbe link reset added when link never comes back
mvneta per-cpu queue mapping removed for Armada 3700
ibmvnic memory barrier protection added for long-term buffers

Driver Updates

Multiple driver categories receive targeted fixes:

USB: DWC3 gadget interval configuration corrected for fullspeed interrupts and DEPCFG handling; musb runtime PM race condition fixed; serial drivers (mos7720, mos7840, ftdi_sio) corrected error codes

Storage: AHCI Broadcom regulator management restored; ext4 htree index checksum corruption fixed; f2fs attribute corruption prevented

Input Devices: Raydium touchscreen zero-length transfers blocked; ASUS Zenbook Flip added to i8042 noselftest list; PowerA Enhanced controller support added

Media: UVC video now accepts invalid bFormatIndex/bFrameIndex values; CX25821 DMA reallocation memleak fixed; VSP1 error handling improved

Wireless: ath9k debugfs nf_override data bus crash fixed; ath10k CE pipe init error handling improved; b43 N-PHY coef update fixed for revision >= 3

Security and Cryptography

Blacklist flag type confusion in certs module corrected
TPM_TIS locality acquisition and cleanup improved
KEYS trusted module migratable=1 failure resolved
ECDH helper enforces len >= secret.len in decode_key()
Seccomp missing return statement added

Filesystem and I/O

Ext4 htree index checksum corruption prevented
F2fs inconsistent quota data fixed
NTFS validates standard information attributes
SEQ_FILE per-entry resource management documented
Pat/memtype seq_file iteration fixed
JFFS2 use-after-free in sum operations eliminated

Tracing and Debugging

Kernel panic deadlock in printk resolved
Tracepoint unregistration no longer fails on memory allocation errors
Perf DSO filtering corrected when map not found for sampled address
Perf intel-pt missing CYC processing in PSB fixed

System and Core Changes

Capabilities write protection prevents ambiguous v3 file capabilities
Static key false positive warnings on concurrent dec/inc eliminated
Hotplug lock assertions added for cpuslocked() operations
Dwarf v5 sections added to vmlinux.lds.h
Module symbol table ignores _GLOBAL_OFFSETTABLE for undefined symbol warnings
KDB memory allocations hardened for robustness

For complete details on all 248 patches, consult the linux-stable repository’s 4.19.178 tag or download the full patchset directly.