Long Li c98d9318dc block: return the correct bvec when checking for gaps ... commit c9c9762d4d44dcb1b2ba90cfb4122dc11ceebf31 upstream. After commit 07173c3ec2 ("block: enable multipage bvecs"), a bvec can have multiple pages. But bio_will_gap() still assumes one page bvec while checking for merging. If the pages in the bvec go across the seg_boundary_mask, this check for merging can potentially succeed if only the 1st page is tested, and can fail if all the pages are tested. Later, when SCSI builds the SG list the same check for merging is done in __blk_segment_map_sg_merge() with all the pages in the bvec tested. This time the check may fail if the pages in bvec go across the seg_boundary_mask (but tested okay in bio_will_gap() earlier, so those BIOs were merged). If this check fails, we end up with a broken SG list for drivers assuming the SG list not having offsets in intermediate pages. This results in incorrect pages written to the disk. Fix this by returning the multi-page bvec when testing gaps for merging. Cc: Jens Axboe <axboe@kernel.dk> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Pavel Begunkov <asml.silence@gmail.com> Cc: Ming Lei <ming.lei@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: Jeffle Xu <jefflexu@linux.alibaba.com> Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Fixes: 07173c3ec2 ("block: enable multipage bvecs") Signed-off-by: Long Li <longli@microsoft.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/1623094445-22332-1-git-send-email-longli@linuxonhyperv.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-07-14 16:56:53 +02:00
..
acpi
asm-generic	sched/core: Initialize the idle task with preemption disabled	2021-07-14 16:55:50 +02:00
clocksource	clocksource/drivers/timer-ti-dm: Save and restore timer TIOCP_CFG	2021-07-14 16:56:12 +02:00
crypto	crypto: shash - avoid comparing pointers to exported functions under CFI	2021-07-14 16:55:54 +02:00
drm
dt-bindings	clk: imx8mq: remove SYS PLL 1/2 clock gates	2021-07-14 16:56:20 +02:00
keys	certs: Add EFI_CERT_X509_GUID support for dbx entries	2021-06-30 08:47:30 -04:00
kunit
kvm
linux	block: return the correct bvec when checking for gaps	2021-07-14 16:56:53 +02:00
math-emu
media	media: v4l2-async: Clean v4l2_async_notifier_add_fwnode_remote_subdev	2021-07-14 16:56:11 +02:00
memory
misc
net	net: lwtunnel: handle MTU calculation in forwading	2021-07-14 16:56:32 +02:00
pcmcia
ras
rdma
scsi	scsi: fc: Correct RHBA attributes length	2021-07-14 16:56:52 +02:00
soc
sound
target
trace	SUNRPC: Remove trace_xprt_transmit_queued	2021-05-19 10:13:03 +02:00
uapi	icmp: don't send out ICMP messages with a source address of 0.0.0.0	2021-06-23 14:42:47 +02:00
vdso
video
xen