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Make "parse_commit()" be a lot more careful

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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 <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2005-07-27 15:12:48 -07:00 committed by Junio C Hamano
parent f315724431
commit f7cc77d78b
1 changed files with 11 additions and 5 deletions
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16
commit.c
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@ -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);