mirror/git
1
0
Fork 0
mirror of https://github.com/git/git.git synced 2024-11-18 22:14:34 +01:00
Code

run-command: do not pass child process data into callbacks

Browse Source 
The expected way to pass data into the callback is to pass them via
the customizable callback pointer. The error reporting in
default_{start_failure, task_finished} is not user friendly enough, that
we want to encourage using the child data for such purposes.

Furthermore the struct child data is cleaned by the run-command API,
before we access them in the callbacks, leading to use-after-free
situations.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Beller 2016-02-29 13:57:06 -08:00 committed by Junio C Hamano
parent 62104ba14a
commit 2a73b3dad0
4 changed files with 9 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
run-command.c
View File

@ -902,35 +902,18 @@ struct parallel_processes {
struct strbuf buffered_output; /* of finished children */
};
static int default_start_failure(struct child_process *cp,
struct strbuf *err,
static int default_start_failure(struct strbuf *err,
void *pp_cb,
void *pp_task_cb)
{
int i;
strbuf_addstr(err, "Starting a child failed:");
for (i = 0; cp->argv[i]; i++)
strbuf_addf(err, " %s", cp->argv[i]);
return 0;
}
static int default_task_finished(int result,
struct child_process *cp,
struct strbuf *err,
void *pp_cb,
void *pp_task_cb)
{
int i;
if (!result)
return 0;
strbuf_addf(err, "A child failed with return code %d:", result);
for (i = 0; cp->argv[i]; i++)
strbuf_addf(err, " %s", cp->argv[i]);
return 0;
}
@ -1048,8 +1031,7 @@ static int pp_start_one(struct parallel_processes *pp)
pp->children[i].process.no_stdin = 1;
if (start_command(&pp->children[i].process)) {
code = pp->start_failure(&pp->children[i].process,
&pp->children[i].err,
code = pp->start_failure(&pp->children[i].err,
pp->data,
&pp->children[i].data);
strbuf_addbuf(&pp->buffered_output, &pp->children[i].err);
@ -1117,7 +1099,7 @@ static int pp_collect_finished(struct parallel_processes *pp)
code = finish_command(&pp->children[i].process);
code = pp->task_finished(code, &pp->children[i].process,
code = pp->task_finished(code,
&pp->children[i].err, pp->data,
&pp->children[i].data);

9
run-command.h
View File

@ -158,8 +158,7 @@ typedef int (*get_next_task_fn)(struct child_process *cp,
* To send a signal to other child processes for abortion, return
* the negative signal number.
*/
typedef int (*start_failure_fn)(struct child_process *cp,
struct strbuf *err,
typedef int (*start_failure_fn)(struct strbuf *err,
void *pp_cb,
void *pp_task_cb);
@ -178,7 +177,6 @@ typedef int (*start_failure_fn)(struct child_process *cp,
* the negative signal number.
*/
typedef int (*task_finished_fn)(int result,
struct child_process *cp,
struct strbuf *err,
void *pp_cb,
void *pp_task_cb);
@ -192,9 +190,8 @@ typedef int (*task_finished_fn)(int result,
* (both stdout and stderr) is routed to stderr in a manner that output
* from different tasks does not interleave.
*
* If start_failure_fn or task_finished_fn are NULL, default handlers
* will be used. The default handlers will print an error message on
* error without issuing an emergency stop.
* start_failure_fn and task_finished_fn can be NULL to omit any
* special handling.
*/
int run_processes_parallel(int n,
get_next_task_fn,

7
submodule.c
View File

@ -705,8 +705,7 @@ static int get_next_submodule(struct child_process *cp,
return 0;
}
static int fetch_start_failure(struct child_process *cp,
struct strbuf *err,
static int fetch_start_failure(struct strbuf *err,
void *cb, void *task_cb)
{
struct submodule_parallel_fetch *spf = cb;
@ -716,8 +715,8 @@ static int fetch_start_failure(struct child_process *cp,
return 0;
}
static int fetch_finish(int retvalue, struct child_process *cp,
struct strbuf *err, void *cb, void *task_cb)
static int fetch_finish(int retvalue, struct strbuf *err,
void *cb, void *task_cb)
{
struct submodule_parallel_fetch *spf = cb;

1
test-run-command.c
View File

@ -41,7 +41,6 @@ static int no_job(struct child_process *cp,
}
static int task_finished(int result,
struct child_process *cp,
struct strbuf *err,
void *pp_cb,
void *pp_task_cb)