6.12-stable review patch. If anyone has any objections, please let me know.
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From: Mahanta Jambigi mjambigi@linux.ibm.com
[ Upstream commit cc282f73bc0cbdf3ee7af2f2d3a2ef4e6b19242d ]
Currently SMC code is validating the reserved bits while parsing the incoming CLC decline message & when this validation fails, its treated as a protocol error. As a result, the SMC connection is terminated instead of falling back to TCP. As per RFC7609[1] specs we shouldn't be validating the reserved bits that is part of CLC message. This patch fixes this issue.
CLC Decline message format can viewed here[2].
[1] https://datatracker.ietf.org/doc/html/rfc7609#page-92 [2] https://datatracker.ietf.org/doc/html/rfc7609#page-105
Fixes: 8ade200c269f ("net/smc: add v2 format of CLC decline message") Signed-off-by: Mahanta Jambigi mjambigi@linux.ibm.com Reviewed-by: Sidraya Jayagond sidraya@linux.ibm.com Reviewed-by: Alexandra Winter wintera@linux.ibm.com Reviewed-by: Dust Li dust.li@linux.alibaba.com Link: https://patch.msgid.link/20250902082041.98996-1-mjambigi@linux.ibm.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/smc/smc_clc.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c index 521f5df80e10c..8a794333e9927 100644 --- a/net/smc/smc_clc.c +++ b/net/smc/smc_clc.c @@ -426,8 +426,6 @@ smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc) { struct smc_clc_msg_hdr *hdr = &dclc->hdr;
- if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D) - return false; if (hdr->version == SMC_V1) { if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline)) return false;