From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4127B3368B8; Tue, 21 Jul 2026 17:43:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784655830; cv=none; b=sZUU7UBklegW6g9U98m2dKUfGv03afm+/ciCGtuyk+8AtJr2IgAyvePQ3MBMbpZw6bNXEcvzHdbnPB63IrhijqM5s2zEk10anTfSJ/1xp4bs8g830FS1r79jcgbUrNQ8X3YhiFf4+H1VSI8TYYjOXynCcKk2RCqV+VFT1DUkozI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784655830; c=relaxed/simple; bh=Azm6NVxDDcL6zXyjxhL0IvCAiTarBp1QKz+Z4MTOrtc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IyI+ztVoU/f4ZIWDwivlAFp6DVuLxPbhRNps7e0HHCbaO9RegNkNVwzBQhz/ObHkcgXlkKcVBlSEfPYoNhK+3/HKBSN8lLCmaKM54GfxcSVVrutQ+L56hDaHVkmSukjaycjNZCUg1KudL3gjFHtuMrzGXySvIE9pfp/BNWB8444= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AKJU4YbO; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="AKJU4YbO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A83601F000E9; Tue, 21 Jul 2026 17:43:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784655829; bh=CGIsozrvLlBE+wwUbgMAoCK6e/dVW+xiBEaDEFCPXPo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AKJU4YbOmL01UMoB+jYngVCwlO8/Aa4L2sxxRLnMxeBPHFjpIlEwdQ0eDTAdNHsRj aGjk+WtUL2ynKAIiw/Hw/yDt4xWq6o9W38U7C2tIYu2yPKkEK6zoC+/YSF1wfVLjXL ces2Y8KncMM4NXp4d6qkIq1o7bh8mTb326v5o/Ok= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Carlos Bilbao (Lambda)" , Sara Venkatesh , Bart Van Assche , Leon Romanovsky , Sasha Levin Subject: [PATCH 6.18 0158/1611] RDMA/srpt: fix integer overflow in immediate data length check Date: Tue, 21 Jul 2026 17:04:34 +0200 Message-ID: <20260721152518.435872658@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152514.750365251@linuxfoundation.org> References: <20260721152514.750365251@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sara Venkatesh [ Upstream commit eb4ecdf631fe00e8020bf461503cb9b7017ed796 ] imm_buf->len is a user-controlled uint32_t received from the network. Adding it to imm_data_offset without overflow checking allows a malicious initiator to send len=0xFFFFFFFF, causing req_size to wrap around to a small value, bypassing the bounds check, and subsequently passing a ~4GB length to sg_init_one(). Use check_add_overflow() to detect wrapping before the comparison. Fixes: 5dabcd0456d7 ("RDMA/srpt: Add support for immediate data") Reported-by: Carlos Bilbao (Lambda) Signed-off-by: Sara Venkatesh Link: https://patch.msgid.link/20260504080036.3482415-1-sarajvenkatesh@gmail.com Reviewed-by: Carlos Bilbao (Lambda) Reviewed-by: Bart Van Assche Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/ulp/srpt/ib_srpt.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c index 71269446353dbc..ba70c64a0aa9ea 100644 --- a/drivers/infiniband/ulp/srpt/ib_srpt.c +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c @@ -1129,9 +1129,10 @@ static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx, struct srp_imm_buf *imm_buf = srpt_get_desc_buf(srp_cmd); void *data = (void *)srp_cmd + imm_data_offset; uint32_t len = be32_to_cpu(imm_buf->len); - uint32_t req_size = imm_data_offset + len; + uint32_t req_size; - if (req_size > srp_max_req_size) { + if (check_add_overflow((uint32_t)imm_data_offset, len, &req_size) || + req_size > srp_max_req_size) { pr_err("Immediate data (length %d + %d) exceeds request size %d\n", imm_data_offset, len, srp_max_req_size); return -EINVAL; -- 2.53.0