6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sean Anderson sean.anderson@linux.dev
[ Upstream commit c17ff476f53afb30f90bb3c2af77de069c81a622 ]
If coalesce_count is greater than 255 it will not fit in the register and will overflow. This can be reproduced by running
# ethtool -C ethX rx-frames 256
which will result in a timeout of 0us instead. Fix this by checking for invalid values and reporting an error.
Fixes: 8a3b7a252dca ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver") Signed-off-by: Sean Anderson sean.anderson@linux.dev Reviewed-by: Shannon Nelson shannon.nelson@amd.com Reviewed-by: Radhey Shyam Pandey radhey.shyam.pandey@amd.com Link: https://patch.msgid.link/20250113163001.2335235-1-sean.anderson@linux.dev Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 9f779653ed622..02e11827440b5 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -1571,6 +1571,12 @@ axienet_ethtools_set_coalesce(struct net_device *ndev, return -EFAULT; }
+ if (ecoalesce->rx_max_coalesced_frames > 255 || + ecoalesce->tx_max_coalesced_frames > 255) { + NL_SET_ERR_MSG(extack, "frames must be less than 256"); + return -EINVAL; + } + if (ecoalesce->rx_max_coalesced_frames) lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames; if (ecoalesce->rx_coalesce_usecs)