A typical diff will not show what's going on and you need to see full
functions. The core code is like this, at the end of of write_one()
e->idx.offset = *offset;
size = write_object(f, e, *offset);
if (!size) {
e->idx.offset = recursing;
return WRITE_ONE_BREAK;
}
written_list[nr_written++] = &e->idx;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(*offset, size))
die("pack too large for current definition of off_t");
*offset += size;
Here we can see that the in-pack object size is returned by
write_object (or indirectly by write_reuse_object). And it's used to
calculate object offsets, which end up in the pack index file,
generated at the end.
If "size" overflows (on 32-bit sytems, unsigned long is 32-bit while
off_t can be 64-bit), we got wrong offsets and produce incorrect .idx
file, which may make it look like the .pack file is corrupted.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
builtin/pack-objects.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index df6ecd5..f854ca4 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -341,8 +341,8 @@ static unsigned long write_no_reuse_object(struct sha1file *f, struct object_ent
}
/* Return 0 if we will bust the pack-size limit */
-static unsigned long write_reuse_object(struct sha1file *f, struct object_entry *entry,
- unsigned long limit, int usable_delta)
+static off_t write_reuse_object(struct sha1file *f, struct object_entry *entry,
+ unsigned long limit, int usable_delta)
{
struct packed_git *p = entry->in_pack;
struct pack_window *w_curs = NULL;
@@ -415,11 +415,12 @@ static unsigned long write_reuse_object(struct sha1file *f, struct object_entry
}
/* Return 0 if we will bust the pack-size limit */
-static unsigned long write_object(struct sha1file *f,
- struct object_entry *entry,
- off_t write_offset)
+static off_t write_object(struct sha1file *f,
+ struct object_entry *entry,
+ off_t write_offset)
{
- unsigned long limit, len;
+ unsigned long limit;
+ off_t len;
int usable_delta, to_reuse;
if (!pack_to_stdout)
@@ -491,7 +492,7 @@ static enum write_one_status write_one(struct sha1file *f,
struct object_entry *e,
off_t *offset)
{
- unsigned long size;
+ off_t size;
int recursing;
/*
--
2.8.2.537.g0965dd9
--
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