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struct qm_sg_entry :: offset is a 13-bit field, declared as __be16. When using be32_to_cpu(), a wrong value will be calculated on little endian systems (Arm), because type promotion from 16-bit to 32-bit, which is done before the byte swap and always in the CPU native endianness, changes the value of the scatter/gather list entry offset in big-endian interpretation (adds two zero bytes in the LSB interpretation). The result of the byte swap is ANDed with GENMASK(12, 0), so the result is always zero, because only those bytes added by type promotion remain after the application of the bit mask. The impact of the bug is that scatter/gather frames with a non-zero offset into the buffer are treated by the driver as if they had a zero offset. This is all in theory, because in practice, qm_sg_entry_get_off() has a single caller, where the bug is inconsequential, because at that call site the buffer offset will always be zero, as will be explained in the subsequent change. Flagged by sparse: warning: cast to restricted __be32 warning: cast from restricted __be16 Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Breno Leitao <leitao@debian.org> Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu> Acked-by: Madalin Bucur <madalin.bucur@oss.nxp.com> Link: https://patch.msgid.link/20241029164317.50182-2-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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