From f7cc77d78b9ee59dce162a50815ac6c1918a4397 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 27 Jul 2005 15:12:48 -0700 Subject: [PATCH] Make "parse_commit()" be a lot more careful This was brought on by a bad tree of Thomas Gleixner, where some bogus commit objects weren't warned about properly Signed-off-by: Linus Torvalds --- commit.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/commit.c b/commit.c index caee5bc21..d4cd45580 100644 --- a/commit.c +++ b/commit.c @@ -93,22 +93,28 @@ static unsigned long parse_commit_date(const char *buf) int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size) { - void *bufptr = buffer; + char *bufptr = buffer; unsigned char parent[20]; struct commit_list **pptr; if (item->object.parsed) return 0; item->object.parsed = 1; - get_sha1_hex(bufptr + 5, parent); + if (memcmp(bufptr, "tree ", 5)) + return error("bogus commit object %s", sha1_to_hex(item->object.sha1)); + if (get_sha1_hex(bufptr + 5, parent) < 0) + return error("bad tree pointer in commit %s\n", sha1_to_hex(item->object.sha1)); item->tree = lookup_tree(parent); if (item->tree) add_ref(&item->object, &item->tree->object); bufptr += 46; /* "tree " + "hex sha1" + "\n" */ pptr = &item->parents; - while (!memcmp(bufptr, "parent ", 7) && - !get_sha1_hex(bufptr + 7, parent)) { - struct commit *new_parent = lookup_commit(parent); + while (!memcmp(bufptr, "parent ", 7)) { + struct commit *new_parent; + + if (get_sha1_hex(bufptr + 7, parent) || bufptr[47] != '\n') + return error("bad parents in commit %s", sha1_to_hex(item->object.sha1)); + new_parent = lookup_commit(parent); if (new_parent) { pptr = &commit_list_insert(new_parent, pptr)->next; add_ref(&item->object, &new_parent->object); -- 2.26.2