[GUACAMOLE-433] guacd rdp plugin segfault sometimes

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 0.9.12-incubating
• Component/s: RDP
• Environment: GNU Linux x86_64
• Assignee: Unassigned
• Reporter: James He
• Created: 10/Nov/17 18:35
• Updated: 02/Feb/18 21:35
• Resolved: 02/Feb/18 21:35

Description

Observed guacd segfault when using RDP.

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00002aaaafb6927a in guac_rdp_keyboard_update_keysym (keyboard=0x2aaabbe22010, keysym=65293, pressed=1)
    at keyboard.c:372
372         if (!keyboard->synchronized) {
(gdb) p keyboard->synchronized
Cannot access memory at address 0x2aaabbe2201c
(gdb) bt
#0  0x00002aaaafb6927a in guac_rdp_keyboard_update_keysym (keyboard=0x2aaabbe22010, keysym=65293, pressed=1)
    at keyboard.c:372
#1  0x00002aaaafb68b13 in guac_rdp_user_key_handler (user=0x2aaab4004bb0, keysym=65293, pressed=1)
    at input.c:131
#2  0x00002aaaaaf4dca6 in __guac_handle_key (user=0x2aaab4004bb0, argc=2, argv=0x2aaab400baf0)
    at user-handlers.c:145
#3  0x00002aaaaaf4d3ea in guac_user_handle_instruction (user=0x2aaab4004bb0, opcode=0x2aaab400cef5 "key",
    argc=2, argv=0x2aaab400baf0) at user.c:178
#4  0x00000000004055e7 in guacd_user_input_thread (data=0x2aaaaeb52d20) at user.c:127
#5  0x00002aaaab8521a4 in start_thread (arg=0x2aaaaf354700) at pthread_create.c:309
#6  0x00002aaaabd5965d in clone () from /lib64/libc.so.6