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authorMartin Koegler <mkoegler@auto.tuwien.ac.at>2008-01-06 17:21:10 (GMT)
committerJunio C Hamano <gitster@pobox.com>2008-01-07 02:41:44 (GMT)
commit64cc1c0909949fa2866ad71ad2d1ab7ccaa673d9 (patch)
tree38dc3d651f1edfacaff677744056e9870b8f27ea /git.spec.in
parent47ee06f1224cc355d0d5fffb0a65b831790b2845 (diff)
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tree-walk: don't parse incorrect entries
The current code can access memory outside of the tree buffer in the case of malformed tree entries. This patch prevents this by: * The rest of the buffer must be at least 24 bytes (at least 1 byte mode, 1 blank, at least one byte path name, 1 NUL, 20 bytes sha1). * Check that the last NUL (21 bytes before the end) is present. This ensures that strlen() and get_mode() calls stay within the buffer. * The mode may not be empty. We have only to reject a blank at the begin, as the rest is handled by if (c < '0' || c > '7'). * The blank is ensured by get_mode(). * The path must contain at least one character. Signed-off-by: Martin Koegler <mkoegler@auto.tuwien.ac.at> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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