net: ethtool: reject an out of range hwtstamp provider index

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A provider index of 0xFFFFFFFF picks a provider on hardware that has
none. phc_index is an int where -1 means no PHC, and the u32 from user
space ends up as -1, so the two match.

TSINFO_GET uses -1 for "no provider requested" and answers with the
default provider instead of an error.

Reject the value in the netlink policy, which covers every comparison
site.

Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20260925135237.3432266-2-nb@tipi-net.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Nicolai Buchwitz 2026-09-25 15:52:35 +02:00 • committed by Jakub Kicinski

parent 0a1a3898ab

commit 67da300938

1 changed files with 7 additions and 1 deletions

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net/ethtool/ts.h

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