On 20.06.2021 14:38:42, Norbert Slusarek wrote:

If optval != NULL and optlen = 0 are specified for SO_J1939_FILTER in
j1939_sk_setsockopt(), memdup_sockptr() will return ZERO_PTR for 0 size
allocation. The new filter will be mistakenly assigned ZERO_PTR.
This patch checks for optlen != 0 and filter will be assigned NULL
in case of optlen = 0.

Fixes: a7b75c5a8c41 ("net: pass a sockptr_t into ->setsockopt")
Signed-off-by: Norbert Slusarek <redacted>

The problem was in the initial commit, too. Changed Fixes tags
accordingly to:

| Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")

applied to linux-can/testing

regards,
Marc

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