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Fix potential use after free in read_tpm_banks()

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On failure to read TPM 2.0 bank PCRs 'errmsg' is not properly set to
NULL after being freed.  Fix potential use after free.

Fixes: 3472f9ba9c05 ("ima-evm-utils: read the PCRs for the requested TPM banks")
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Mimi Zohar 2022-08-26 14:10:43 -04:00
parent c1635add22
commit f2b1b66b7c
1 changed files with 1 additions and 0 deletions
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src/evmctl.c
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@ -2075,6 +2075,7 @@ static int read_tpm_banks(int num_banks, struct tpm_bank_info *bank)
log_debug("Failed to read %s PCRs: (%s)\n",
bank[i].algo_name, errmsg);
free(errmsg);
errmsg = NULL;
bank[i].supported = 0;
}
}