dpaa2-switch: fix the error path in dpaa2_switch_rx()

Overview

In the Linux kernel, the following vulnerability has been resolved:

dpaa2-switch: fix the error path in dpaa2_switch_rx()

In case of an error in dpaa2_switch_rx(), the dpaa2_switch_free_fd() function is called in order to free the FD. This is incorrect since the dpaa2_switch_free_fd() is intended to be used on Tx frame descriptors, meaning that it expects in the software annotation area of the FD data to find a valid skb pointer on which to call dev_kfree_skb().

Fix this by extracting the dma_unmap_page() from dpaa2_switch_build_linear_skb() directly into the dpaa2_switch_rx() function. This allows us to directly use free_pages() in case of an error before an SKB was created and kfree_skb() afterwards.

Affected

• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 791068c962469af0090e1a1ee63657fb9eef40db
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ee54f8d7e642c44cfcc2dcb390b4c50e145d81b8
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 259ad6093204b999d41e7e6d0ad90ef9a71a44ab
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f4ceb8e3d6d5becb4cda7a7098a8638e18c835a1
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fa232b4496cb59503ae5108c756cbe10e59b0bc3
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 74c1c9f5c0c30bbd0c2cf87b6e3507e7ea46c13d
• Linux < 5.15.222
• Linux < 6.1.189
• Linux < 6.6.158
• Linux < 6.12.111
• Linux < 6.18.53
• Linux (all versions)

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.