[LU-15545] lgss_sk crash because of freeing twice

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: Feng Lei
• Reporter: Li Xi

Description

When a key "xxx" alreasy exists, following command would crash:

# /usr/sbin/lgss_sk -t client -f lustre0 -w xxx
Reading random data for shared key from '/dev/random'
Generating DH parameters, this can take a while...
error: opening 'xxx': File exists
*** Error in `/usr/sbin/lgss_sk': free(): invalid size: 0x000000000226ff90 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x81329)[0x7fc28d9e4329]
/lib64/libcrypto.so.10(CRYPTO_free+0x1d)[0x7fc28e51780d]
/lib64/libcrypto.so.10(BN_clear_free+0x50)[0x7fc28e575a20]
/lib64/libcrypto.so.10(DH_free+0x75)[0x7fc28e5ba125]
/usr/sbin/lgss_sk[0x402caa]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7fc28d985555]
/usr/sbin/lgss_sk[0x4031f3]
======= Memory map: ========

This is caused by calling DH_free() on the same address for twice.