Merge branch 'ipv4-handle-nexthop-group-shrink-races'

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Daehyeon Ko says:

====================
ipv4: handle nexthop group shrink races

fib_info_num_path() and fib_info_nhc() can observe different RCU
generations of a replaceable nexthop group.  An indexed consumer can
therefore accept an index from a larger group and receive NULL after a
concurrent shrink.

Patch 1 is unchanged from v1.  Patch 2 addresses the analogous
fib_dump_info_fnhe() race Ido identified.  Auditing the remaining
accessor pairs found the same issue in the RCU-only hardware-flag
notification path, fixed by patch 3.  Separate patches retain the
correct Fixes tag for each concurrency boundary.
====================

Link: https://patch.msgid.link/cover.1790915964.git.4ncienth@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jakub Kicinski 2026-10-06 16:23:11 -07:00

parent a463f55c79 d3daa33c7a

commit 588003f740

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3

net/ipv4/fib_semantics.c

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5

net/ipv4/route.c

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