nvmet-tcp: add bounds checks in nvmet_tcp_build_pdu_iovec

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commit 52a0a98549 upstream.

nvmet_tcp_build_pdu_iovec() could walk past cmd->req.sg when a PDU
length or offset exceeds sg_cnt and then use bogus sg->length/offset
values, leading to _copy_to_iter() GPF/KASAN. Guard sg_idx, remaining
entries, and sg->length/offset before building the bvec.

Fixes: 872d26a391 ("nvmet-tcp: add NVMe over TCP target driver")
Signed-off-by: YunJe Shin <ioerts@kookmin.ac.kr>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Joonkyo Jung <joonkyoj@yonsei.ac.kr>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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YunJe Shin 2026-01-28 09:41:07 +09:00 • committed by Greg Kroah-Hartman

parent ff21773827

commit 19672ae68d

1 changed files with 17 additions and 0 deletions

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drivers/nvme/target/tcp.c

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