[bluez/bluez] 557366: textfile: Fix possible bad memory access in find_key

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  Branch: refs/heads/master
  Home:   https://github.com/bluez/bluez
  Commit: 5573661fc2a3e2458ef8cd29e00bea83bb67392e
      https://github.com/bluez/bluez/commit/5573661fc2a3e2458ef8cd29e00bea83bb67392e
  Author: Yun-Hao Chung <howardchung@xxxxxxxxxx>
  Date:   2024-11-01 (Fri, 01 Nov 2024)

  Changed paths:
    M src/textfile.c

  Log Message:
  -----------
  textfile: Fix possible bad memory access in find_key

If the searched key is a prefix of the first key in the textfile,
the code will assume it's not the first line which is wrong.

The issue can be reproduced by a fuzzer. More context can be found in
https://issues.oss-fuzz.com/issues/42515619

To reproduce the issue, please kindly follow the instructions in
https://google.github.io/oss-fuzz/advanced-topics/reproducing/

Stack trace:
    #0 0x55e1c450e7ce in find_key /src/bluez/src/textfile.c:133:9
    #1 0x55e1c450e7ce in write_key /src/bluez/src/textfile.c:244:8
    #2 0x55e1c450dc33 in LLVMFuzzerTestOneInput /src/fuzz_textfile.c:61:3
    (...trace in fuzzer)



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