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linux/drivers/net/wwan
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Kery Qi f0813bcd2d net: wwan: t7xx: fix potential skb->frags overflow in RX path 
When receiving data in the DPMAIF RX path,
the t7xx_dpmaif_set_frag_to_skb() function adds
page fragments to an skb without checking if the number of
fragments has exceeded MAX_SKB_FRAGS. This could lead to a buffer overflow
in skb_shinfo(skb)->frags[] array, corrupting adjacent memory and
potentially causing kernel crashes or other undefined behavior.

This issue was identified through static code analysis by comparing with a
similar vulnerability fixed in the mt76 driver commit b102f0c522 ("mt76:
fix array overflow on receiving too many fragments for a packet").

The vulnerability could be triggered if the modem firmware sends packets
with excessive fragments. While under normal protocol conditions (MTU 3080
bytes, BAT buffer 3584 bytes),
a single packet should not require additional
fragments, the kernel should not blindly trust firmware behavior.
Malicious, buggy, or compromised firmware could potentially craft packets
with more fragments than the kernel expects.

Fix this by adding a bounds check before calling skb_add_rx_frag() to
ensure nr_frags does not exceed MAX_SKB_FRAGS.

The check must be performed before unmapping to avoid a page leak
and double DMA unmap during device teardown.

Fixes: d642b012df ("net: wwan: t7xx: Add data path interface")
Signed-off-by: Kery Qi <qikeyu2017@gmail.com>
Link: https://patch.msgid.link/20260122170401.1986-2-qikeyu2017@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2026-01-25 14:43:32 -08:00
..
iosm net: wwan: iosm: Fix memory leak in ipc_mux_deinit() 2026-01-04 10:46:38 -08:00
t7xx net: wwan: t7xx: fix potential skb->frags overflow in RX path 2026-01-25 14:43:32 -08:00
Kconfig Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-11-10 17:43:53 -08:00
Makefile net: wwan: t7xx: Add core components 2022-05-09 10:51:59 +01:00
mhi_wwan_ctrl.c wwan: core: Support slicing in port TX flow of WWAN subsystem 2023-03-17 22:38:31 -07:00
mhi_wwan_mbim.c Revert "net: wwan: mhi_wwan_mbim: Avoid -Wflex-array-member-not-at-end warning" 2026-01-21 19:03:37 -08:00
qcom_bam_dmux.c net: wwan: Remove redundant pm_runtime_mark_last_busy() calls 2025-10-29 18:55:56 -07:00
rpmsg_wwan_ctrl.c net: wwan: replace deprecated strncpy with strscpy 2023-10-20 18:15:05 -07:00
wwan_core.c net: Use link/peer netns in newlink() of rtnl_link_ops 2025-02-21 15:28:02 -08:00
wwan_hwsim.c net: WQ_PERCPU added to alloc_workqueue users 2025-09-22 17:40:30 -07:00