We detect the "import-marks" capability by looking for that
string, but _without_ a trailing space. Then we skip past it
using strlen("import-marks "), with a space. So if a remote
helper gives us exactly "import-marks", we will read past
the end-of-string by one character.
This is unlikely to be a problem in practice, because such
input is malformed in the first place, and because there is
a good chance that the string has an extra NUL terminator
one character after the original (because it formerly had a
newline in it that we parsed off).
We can fix it by using skip_prefix with "import-marks ",
with the space. The other form appears to be a typo from
a515ebe (transport-helper: implement marks location as
capability, 2011-07-16); "import-marks" has never existed
without an argument, and it should match the "export-marks"
definition above.
Speaking of which, we can also use skip_prefix in a few
other places while we are in the function.
Signed-off-by: Jeff King <p...@peff.net>
---
transport-helper.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/transport-helper.c b/transport-helper.c
index 84c616f..3d8fe7d 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -153,7 +153,7 @@ static struct child_process *get_helper(struct transport
*transport)
write_constant(helper->in, "capabilities\n");
while (1) {
- const char *capname;
+ const char *capname, *arg;
int mandatory = 0;
if (recvline(data, &buf))
exit(128);
@@ -183,19 +183,19 @@ static struct child_process *get_helper(struct transport
*transport)
data->export = 1;
else if (!strcmp(capname, "check-connectivity"))
data->check_connectivity = 1;
- else if (!data->refspecs && starts_with(capname, "refspec ")) {
+ else if (!data->refspecs && skip_prefix(capname, "refspec ",
&arg)) {
ALLOC_GROW(refspecs,
refspec_nr + 1,
refspec_alloc);
- refspecs[refspec_nr++] = xstrdup(capname +
strlen("refspec "));
+ refspecs[refspec_nr++] = xstrdup(arg);
} else if (!strcmp(capname, "connect")) {
data->connect = 1;
} else if (!strcmp(capname, "signed-tags")) {
data->signed_tags = 1;
- } else if (starts_with(capname, "export-marks ")) {
- data->export_marks = xstrdup(capname +
strlen("export-marks "));
- } else if (starts_with(capname, "import-marks")) {
- data->import_marks = xstrdup(capname +
strlen("import-marks "));
+ } else if (skip_prefix(capname, "export-marks ", &arg)) {
+ data->export_marks = xstrdup(arg);
+ } else if (skip_prefix(capname, "import-marks ", &arg)) {
+ data->import_marks = xstrdup(arg);
} else if (starts_with(capname, "no-private-update")) {
data->no_private_update = 1;
} else if (mandatory) {
--
2.0.0.566.gfe3e6b2
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