[PATCH ima-evm-utils v4 11/17] 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@xxxxxxx>
Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
---
 src/evmctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/evmctl.c b/src/evmctl.c
index 4817eeba01c0..c224e17ee620 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -2070,6 +2070,7 @@ 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;
 			}
 		}
-- 
2.31.1




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