[PATCH 1/3] gpg: Close stderr once finished with it in verify_signed_buffer()

[Stephen Boyd <sboyd@codeaurora.org>]

Failing to close the stderr pipe in verify_signed_buffer() causes
git to run out of file descriptors if there are many calls to
verify_signed_buffer(). An easy way to trigger this is to run

 git log --show-signature --merges | grep "key"

on the linux kernel git repo. Eventually it will fail with

 error: cannot create pipe for gpg: Too many open files
 error: could not run gpg.

Close the stderr pipe so that this can't happen.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 gpg-interface.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gpg-interface.c b/gpg-interface.c
index 0863c61..2c0bed3 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -133,6 +133,8 @@ int verify_signed_buffer(const char *payload, size_t payload_size,
 	if (gpg_output)
 		strbuf_read(gpg_output, gpg.err, 0);
 	ret = finish_command(&gpg);
+	if (gpg_output)
+		close(gpg.err);
 
 	unlink_or_warn(path);
 
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