[bluez/bluez] 183f1a: shared/shell: Fix SIGSEGV on invalid input

[bluez/bluez] 183f1a: shared/shell: Fix SIGSEGV on invalid input

[Wouter]

  Branch: refs/heads/1069318
  Home:   https://github.com/bluez/bluez
  Commit: 183f1ac1578b41868c56b5527139f27a2d04a2a0
      https://github.com/bluez/bluez/commit/183f1ac1578b41868c56b5527139f27a2d04a2a0
  Author: Wouter <wouter@xesxen.nl>
  Date:   2026-03-19 (Thu, 19 Mar 2026)

  Changed paths:
    M src/shared/shell.c

  Log Message:
  -----------
  shared/shell: Fix SIGSEGV on invalid input

This fixes a crash when handling "<space><tab>"

==3760495== Invalid read of size 1
==3760495==    at 0x4902187: strcmp (vg_replace_strmem.c:941)
==3760495==    by 0x4067408: menu_completion (shell.c:1126)
==3760495==    by 0x40675DE: shell_completion (shell.c:1177)
==3760495==    by 0x4B267AB: gen_completion_matches (complete.c:1282)
==3760495==    by 0x4B2F8C1: rl_complete_internal (complete.c:2104)
==3760495==    by 0x4B26B52: _rl_dispatch_subseq (readline.c:941)
==3760495==    by 0x4B27B71: readline_internal_char (readline.c:690)
==3760495==    by 0x4B48695: rl_callback_read_char (callback.c:275)
==3760495==    by 0x40655F2: bt_shell_input_line (shell.c:309)
==3760495==    by 0x406577E: input_read (shell.c:343)
==3760495==    by 0x4068CB4: watch_callback (io-glib.c:173)
==3760495==    by 0x49C1F4C: g_main_dispatch (gmain.c:3565)
==3760495==  Address 0x0 is not stack'd, malloc'd or (recently) free'd



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