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authorFlorian Fainelli <f.fainelli@gmail.com>2017-10-20 15:59:30 -0700
committerDavid S. Miller <davem@davemloft.net>2017-10-23 05:28:40 +0100
commite83b171568e6a69cff5eb592907b71e480b535ac (patch)
treeddac2e83934fb6850e25b5e48effd37892edccf0 /net/core
parentfbd15f48e052b3f6bdb21857e8bcaac63bfbb3fd (diff)
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net: systemport: Guard against unmapped TX ring
Because SYSTEMPORT is a (semi) normal network device, the stack may attempt to queue packets on it oustide of the DSA slave transmit path. When that happens, the DSA layer has not had a chance to tag packets with the appropriate per-port and per-queue information, and if that happens and we don't have a port 0 queue 0 available (e.g: on boards where this does not exist), we will hit a NULL pointer de-reference in bcm_sysport_select_queue(). Guard against such cases by testing for the TX ring validity. Fixes: 84ff33eeb23d ("net: systemport: Establish DSA network device queue mapping") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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