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gpg-interface: fix leak of strbufs in get_ssh_key_fingerprint() 

We read stdout from gpg into a strbuf, then split it into a list of
strbufs, pull out one element, and return it. But we don't free either
the original stdout buffer, nor the list returned from strbuf_split().

This patch fixes both. Note that we have to detach the returned string
from its strbuf before calling strbuf_list_free(), as that would
otherwise throw it away.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2021-10-18 13:15:37 -04:00 committed by Junio C Hamano
parent 78d468f1a9
commit f3af71c947
1 changed files with 5 additions and 1 deletions
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6
gpg-interface.c
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@ -711,6 +711,7 @@ static char *get_ssh_key_fingerprint(const char *signing_key)
int ret = -1;
struct strbuf fingerprint_stdout = STRBUF_INIT;
struct strbuf **fingerprint;
char *fingerprint_ret;
/*
* With SSH Signing this can contain a filename or a public key
@ -737,7 +738,10 @@ static char *get_ssh_key_fingerprint(const char *signing_key)
die_errno(_("failed to get the ssh fingerprint for key '%s'"),
signing_key);
return strbuf_detach(fingerprint[1], NULL);
fingerprint_ret = strbuf_detach(fingerprint[1], NULL);
strbuf_list_free(fingerprint);
strbuf_release(&fingerprint_stdout);
return fingerprint_ret;
}
/* Returns the first public key from an ssh-agent to use for signing */