[BACKPORT] dhcpc: fix potential invalid memory reads #11
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- check for minimum packet length (44 bytes, which includes the fields we read next) - pass the correct remaining buffer length to dhcpc_parseoptions() - dhcpc_parseoptions(): ensure we never read past the end of the buffer
davids5
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Jul 21, 2021
- check for minimum packet length (44 bytes, which includes the fields we read next) - pass the correct remaining buffer length to dhcpc_parseoptions() - dhcpc_parseoptions(): ensure we never read past the end of the buffer Co-authored-by: Beat Küng <[email protected]>
PX4BuildBot
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Dec 17, 2024
…ter was read
#0 0x43c7443a in strnlen nuttx/libs/libc/string/lib_strnlen.c:42
#1 0x43c698aa in vsprintf_internal nuttx/libs/libc/stdio/lib_libvsprintf.c:933
#2 0x43c6ca80 in lib_vsprintf nuttx/libs/libc/stdio/lib_libvsprintf.c:1383
#3 0x4409c0bd in vsnprintf nuttx/libs/libc/stdio/lib_vsnprintf.c:72
#4 0x47137cd0 in vcmocka_print_error apps/testing/cmocka/cmocka/src/cmocka.c:2097
#5 0x47139573 in cmocka_print_error apps/testing/cmocka/cmocka/src/cmocka.c:2422
#6 0x471376ff in string_equal_display_error apps/testing/cmocka/cmocka/src/cmocka.c:1410
#7 0x471379a0 in _assert_string_equal apps/testing/cmocka/cmocka/src/cmocka.c:1952
#8 0x4433d972 in read_default apps/testing/drivertest/drivertest_uart.c:242
#9 0x4713c6cd in cmocka_run_one_test_or_fixture apps/testing/cmocka/cmocka/src/cmocka.c:3029
#10 0x4713d487 in cmocka_run_one_tests apps/testing/cmocka/cmocka/src/cmocka.c:3143
#11 0x4713f2ca in _cmocka_run_group_tests apps/testing/cmocka/cmocka/src/cmocka.c:3294
#12 0x443444c6 in cmocka_driver_uart_main apps/testing/drivertest/drivertest_uart.c:358
#13 0x4409a472 in nxtask_startup nuttx/libs/libc/sched/task_startup.c:72
#14 0x43dc92e7 in nxtask_start nuttx/sched/task/task_start.c:116
#15 0x43e31f00 in pre_start nuttx/arch/sim/src/sim/sim_initialstate.c:52
Signed-off-by: zhangshoukui <[email protected]>
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Summary
Impact
Testing