libbsc/chan_alloc: Fix size of pchan to hold the +CBCH channels as well

show net with an CCCH+SDCCH/4+CBCH channel active caused bts_chan_load to read
from invalid memory. Fix this by making sure the pchan array is large enough.

==30346==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff9bdc5dc8 at pc 0x5aeece bp 0x7fff9bdc5350 sp 0x7fff9bdc5348
READ of size 4 at 0x7fff9bdc5dc8 thread T0
    #0 0x5aeecd in bts_chan_load /home/alphaone/scm/osmo/openbsc/openbsc/src/libbsc/chan_alloc.c:490
    #1 0x5af706 in network_chan_load /home/alphaone/scm/osmo/openbsc/openbsc/src/libbsc/chan_alloc.c:511
    #2 0x4b7410 in net_dump_vty /home/alphaone/scm/osmo/openbsc/openbsc/src/libbsc/bsc_vty.c:208
    #3 0x4b5f23 in show_net /home/alphaone/scm/osmo/openbsc/openbsc/src/libbsc/bsc_vty.c:227
    #4 0x7fdabaa425bd in cmd_execute_command_real /home/alphaone/scm/osmo/libosmocore/src/vty/command.c:2042
    #5 0x7fdabaa3f124 in cmd_execute_command /home/alphaone/scm/osmo/libosmocore/src/vty/command.c:2077
    #6 0x7fdabaa850e9 in vty_command /home/alphaone/scm/osmo/libosmocore/src/vty/vty.c:402
    #7 0x7fdabaa75962 in vty_execute /home/alphaone/scm/osmo/libosmocore/src/vty/vty.c:666
    #8 0x7fdabaa6d947 in vty_read /home/alphaone/scm/osmo/libosmocore/src/vty/vty.c:1408
    #9 0x7fdabaa9165f in client_data /home/alphaone/scm/osmo/libosmocore/src/vty/telnet_interface.c:119
    #10 0x7fdaba7860b6 in osmo_select_main /home/alphaone/scm/osmo/libosmocore/src/select.c:160
    #11 0x43c656 in main /home/alphaone/scm/osmo/openbsc/openbsc/src/osmo-nitb/bsc_hack.c:355
    #12 0x7fdab92604bc (/lib64/libc.so.6+0x224bc)
    #13 0x43b6cc (/home/alphaone/local/osmo-asan/bin/osmo-nitb+0x43b6cc)
Address 0x7fff9bdc5dc8 is located in stack of thread T0 at offset 232 in frame
    #0 0x4b5faf in net_dump_vty /home/alphaone/scm/osmo/openbsc/openbsc/src/libbsc/bsc_vty.c:182
  This frame has 3 object(s):
    [32, 40) ''
    [96, 104) ''
    [160, 224) 'pl'
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /home/alphaone/scm/osmo/openbsc/openbsc/src/libbsc/chan_alloc.c:490 bts_chan_load

0 files changed, 0 insertions, 0 deletions