threads / patch / 27830

patchremote-curl: Add a format check to parsing of info/refs

Subject: [PATCH] remote-curl: Add a format check to parsing of info/refs

## tl;dr

One message between Jul 16, 2011 and Jul 16, 2011. Diffs are folded; open one to read it.

replies: 0people: 1as markdown or json

Julian Phillips· Jul 16, 2011, 18:23 UTC · lore

When parsing info/refs, no checks were applied that the file was in the requried format. Since the file is read from a remote webserver, this isn't guarenteed to be true. Add a check that the file at least only contains lines that consist of 40 characters followed by a tab and then the ref name.

Signed-off-by: Julian Phillips <julian@quantumfyre.co.uk>
---

If you happen to try, for example, git ls-remote http://example.com/foo, when http://example.com/foo/info/refs exists - but isn't part of a git repository you get a very strange response as remote-curl.c attempts to parse refs out of the file. This may be an unlikely situtation, but that doesn't mean it can't be hanlded a little better.

Julian
 remote-curl.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
Show changes to remote-curl.c +2 −0
diff --git a/remote-curl.c b/remote-curl.c
index b5be25c..8ac5028 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -227,6 +227,8 @@ static struct ref *parse_info_refs(struct discovery *heads)
 		if (data[i] == '\t')
 			mid = &data[i];
 		if (data[i] == '\n') {
+			if (mid - start != 40)
+				die("%sinfo/refs not valid: is this a git repository?", url);
 			data[i] = 0;
 			ref_name = mid + 1;
 			ref = xmalloc(sizeof(struct ref) +
-- 
1.7.6

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