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Filename Latest commit message Latest commit date
Geert Uytterhoeven f0465803fa net: dst: Force 4-byte alignment of dst_metrics 
[ Upstream commit 258a980d1ec23e2c786e9536a7dd260bea74bae6 ]

When storing a pointer to a dst_metrics structure in dst_entry._metrics,
two flags are added in the least significant bits of the pointer value.
Hence this assumes all pointers to dst_metrics structures have at least
4-byte alignment.

However, on m68k, the minimum alignment of 32-bit values is 2 bytes, not
4 bytes.  Hence in some kernel builds, dst_default_metrics may be only
2-byte aligned, leading to obscure boot warnings like:

    WARNING: CPU: 0 PID: 7 at lib/refcount.c:28 refcount_warn_saturate+0x44/0x9a
    refcount_t: underflow; use-after-free.
    Modules linked in:
    CPU: 0 PID: 7 Comm: ksoftirqd/0 Tainted: G        W         5.5.0-rc2-atari-01448-g114a1a1038af891d-dirty #261
    Stack from 10835e6c:
	    10835e6c 0038134f 00023fa6 00394b0f 0000001c 00000009 00321560 00023fea
	    00394b0f 0000001c 001a70f8 00000009 00000000 10835eb4 00000001 00000000
	    04208040 0000000a 00394b4a 10835ed4 00043aa8 001a70f8 00394b0f 0000001c
	    00000009 00394b4a 0026aba8 003215a4 00000003 00000000 0026d5a8 00000001
	    003215a4 003a4361 003238d6 000001f0 00000000 003215a4 10aa3b00 00025e84
	    003ddb00 10834000 002416a8 10aa3b00 00000000 00000080 000aa038 0004854a
    Call Trace: [<00023fa6>] __warn+0xb2/0xb4
     [<00023fea>] warn_slowpath_fmt+0x42/0x64
     [<001a70f8>] refcount_warn_saturate+0x44/0x9a
     [<00043aa8>] printk+0x0/0x18
     [<001a70f8>] refcount_warn_saturate+0x44/0x9a
     [<0026aba8>] refcount_sub_and_test.constprop.73+0x38/0x3e
     [<0026d5a8>] ipv4_dst_destroy+0x5e/0x7e
     [<00025e84>] __local_bh_enable_ip+0x0/0x8e
     [<002416a8>] dst_destroy+0x40/0xae

Fix this by forcing 4-byte alignment of all dst_metrics structures.

Fixes: e5fd387ad5 ("ipv6: do not overwrite inetpeer metrics prematurely")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-31 16:41:17 +01:00
..
acpi ACPI / utils: Move acpi_dev_get_first_match_dev() under CONFIG_ACPI 2019-12-17 19:56:29 +01:00
asm-generic timekeeping/vsyscall: Update VDSO data unconditionally 2019-11-04 23:02:53 +01:00
clocksource
crypto Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity 2019-09-27 19:37:27 -07:00
drm drm/shmem: Add docbook comments for drm_gem_shmem_object madvise fields 2019-11-06 17:57:42 -06:00
dt-bindings
keys
kvm
linux mod_devicetable: fix PHY module format 2019-12-31 16:41:16 +01:00
math-emu
media
misc
net net: dst: Force 4-byte alignment of dst_metrics 2019-12-31 16:41:17 +01:00
pcmcia
ras
rdma RDMA/core: Fix ib_dma_max_seg_size() 2019-12-17 19:56:41 +01:00
scsi SCSI fixes on 20191015 2019-10-15 12:19:08 -07:00
soc
sound ALSA: hda: Modify stream stripe mask only when needed 2019-12-13 08:42:39 +01:00
target
trace page_pool: do not release pool until inflight == 0. 2019-12-18 16:09:07 +01:00
uapi media: cec.h: CEC_OP_REC_FLAG_ values were swapped 2019-12-17 19:56:20 +01:00
vdso
video
xen xen: fixes and cleanups for 5.4-rc2 2019-10-04 11:13:09 -07:00
Kbuild - New Drivers 2019-09-23 19:37:49 -07:00