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| author |   Paolo Valente <paolo.valente@unimore.it> | 2012-09-15 00:41:35 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-09-19 16:23:53 -0400 |
| commit | 71261956973ba9e0637848a5adb4a5819b4bae83 (patch) | |
| tree | b73da61b6f4ff0c5156f6f1a2252ed98304366a3 /net/core/skbuff.c | |
| parent | tcp: flush DMA queue before sk_wait_data if rcv_wnd is zero (diff) | |
| download | linux-dev-71261956973ba9e0637848a5adb4a5819b4bae83.tar.xz linux-dev-71261956973ba9e0637848a5adb4a5819b4bae83.zip | |
pkt_sched: fix virtual-start-time update in QFQ
If the old timestamps of a class, say cl, are stale when the class
becomes active, then QFQ may assign to cl a much higher start time
than the maximum value allowed. This may happen when QFQ assigns to
the start time of cl the finish time of a group whose classes are
characterized by a higher value of the ratio
max_class_pkt/weight_of_the_class with respect to that of
cl. Inserting a class with a too high start time into the bucket list
corrupts the data structure and may eventually lead to crashes.
This patch limits the maximum start time assigned to a class.
Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/skbuff.c')
0 files changed, 0 insertions, 0 deletions