[#CONC-513] MSAN use-of-uninitialized-value in strstr() in mariadb_get_install

3.1 93618b4036d61a4425154c7d8bc41647872b64cd
Uninitialized bytes in StrstrCheck at offset 58 inside [0x7fff5b6ab880, 60)
==38278==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x562d177ea77e in strstr (/dev/shm/10.5msan/libmariadb/mariadb_config/mariadb_config+0x2e77e)
#1 0x562d17855fe4 in mariadb_get_install_location /dev/shm/10.5msan/libmariadb/mariadb_config/mariadb_config.c:193:8
#2 0x562d17855688 in main /dev/shm/10.5msan/libmariadb/mariadb_config/mariadb_config.c:214:3
#3 0x7f1ad1985cc9 in __libc_start_main csu/../csu/libc-start.c:308:16
#4 0x562d177dc2a9 in _start (/dev/shm/10.5msan/libmariadb/mariadb_config/mariadb_config+0x202a9)

Uninitialized value was created by an allocation of '' in the stack frame of function 'mariadb_get_install_location'
#0 0x562d17855c60 in mariadb_get_install_location /dev/shm/10.5msan/libmariadb/mariadb_config/mariadb_config.c:146

SUMMARY: MemorySanitizer: use-of-uninitialized-value (/dev/shm/10.5msan/libmariadb/mariadb_config/mariadb_config+0x2e77e) in strstr
Exiting

As far as I can tell, the problem was recently introduced. We fail to ensure that the string is terminated by a NUL byte. Most of the time, it might happen to hold after executing alloca().

[CONC-513] MSAN use-of-uninitialized-value in strstr() in mariadb_get_install_location() Created: 2020-10-30 Updated: 2021-02-01 Resolved: 2020-10-30
Status:	Closed
Project:	MariaDB Connector/C
Component/s:	None
Affects Version/s:	3.1.10
Fix Version/s:	3.1.11

[CONC-513] MSAN use-of-uninitialized-value in strstr() in mariadb_get_install_location() Created: 2020-10-30 Updated: 2021-02-01 Resolved: 2020-10-30