net: stmmac: fix dma mapping leak in stmmac_tso_xmit()

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In stmmac_tso_xmit(), if the DMA mapping of an skb fragment fails, the
frame is dropped but the DMA mappings already created for the linear
part and for the fragments mapped before the failure are never
unmapped, leaking DMA mappings.

Fix the leak by walking back over the descriptors used by the frame and
releasing each of them with stmmac_free_tx_buffer(). Moreover, release
the descriptors with stmmac_release_tx_desc() unmapping the DMA buffers.

Fixes: f748be531d ("stmmac: support new GMAC4")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>
Link: https://patch.msgid.link/20260826-stmmac_dma_unmap_tso-v1-1-a2753d1576ba@oss.qualcomm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Lorenzo Bianconi 2026-08-26 15:03:15 +02:00 • committed by Jakub Kicinski

parent 18666c73af

commit a5d946466a

1 changed files with 34 additions and 19 deletions

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drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

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