When we spawn "git submodule status" to read its output, we
use run_command() followed by strbuf_read() read from the
pipe. This can deadlock if the subprocess output is larger
than the system pipe buffer.
Furthermore, if start_command() fails, we'll try to read
from a bogus descriptor (probably "-1" or a descriptor we
just closed, but it is a bad idea for us to make assumptions
about how start_command implements its error handling). And
if start_command succeeds, we leak the file descriptor for
the pipe to the child.
All of these can be solved by using the capture_command
helper.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
wt-status.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/wt-status.c b/wt-status.c
index b47f6d9..853419f 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -744,11 +744,8 @@ static void wt_status_print_submodule_summary(struct wt_status *s, int uncommitt
sm_summary.git_cmd = 1;
sm_summary.no_stdin = 1;
- sm_summary.out = -1;
- run_command(&sm_summary);
-
- strbuf_read(&cmd_stdout, sm_summary.out, 1024);
+ capture_command(&sm_summary, &cmd_stdout, 1024);
/* prepend header, only if there's an actual output */
if (cmd_stdout.len) {
--
2.3.3.618.ga041503
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