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net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post()

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qrtr_endpoint_post() validates an incoming packet with

	if (!size || len != ALIGN(size, 4) + hdrlen)
		goto err;

where size comes from the wire. On 32-bit, size_t is 32 bits and
ALIGN(size, 4) wraps to 0 for size >= 0xfffffffd, so the check
passes and skb_put_data(skb, data + hdrlen, size) writes past the
hdrlen-sized skb and oopses the kernel. 64-bit is unaffected.

This is the 32-bit residual of ad9d24c942 ("net: qrtr: fix OOB
Read in qrtr_endpoint_post"), which fixed only the 64-bit case.

Reject any size that cannot fit the buffer before the ALIGN.

Fixes: ad9d24c942 ("net: qrtr: fix OOB Read in qrtr_endpoint_post")
Cc: stable@vger.kernel.org
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260611125455.2352279-1-michael.bommarito@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michael Bommarito 2026-06-11 08:54:55 -04:00 committed by Jakub Kicinski
parent d7b0413b35
commit 2005486977
1 changed files with 1 additions and 1 deletions
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2
net/qrtr/af_qrtr.c
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@ -496,7 +496,7 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
if (cb->dst_port == QRTR_PORT_CTRL_LEGACY)
cb->dst_port = QRTR_PORT_CTRL;
if (!size || len != ALIGN(size, 4) + hdrlen)
if (!size || size > len || len != ALIGN(size, 4) + hdrlen)
goto err;
if ((cb->type == QRTR_TYPE_NEW_SERVER ||