From: Matt Cooper <vtbassmatt@xxxxxxxxx>
There is mixed use of size_t and unsigned long to deal with sizes in the
codebase. Recall that Windows defines unsigned long as 32 bits even on
64-bit platforms, meaning that converting size_t to unsigned long narrows
the range. This mostly doesn't cause a problem since Git rarely deals
with files larger than 2^32 bytes.
But adjunct systems such as Git LFS, which use smudge/clean filters to
keep huge files out of the repository, may have huge file contents passed
through some of the functions in entry.c and convert.c. On Windows, this
results in a truncated file being written to the workdir. I traced this to
one specific use of unsigned long in write_entry (and a similar instance
in write_pc_item_to_fd for parallel checkout). That appeared to be for
the call to read_blob_entry, which expects a pointer to unsigned long.
By altering the signature of read_blob_entry to expect a size_t,
write_entry can be switched to use size_t internally (which all of its
callers and most of its callees already used). To avoid touching dozens of
additional files, read_blob_entry uses a local unsigned long to call a
chain of functions which aren't prepared to accept size_t.
Helped-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
Signed-off-by: Matt Cooper <vtbassmatt@xxxxxxxxx>
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
entry.c | 8 +++++---
entry.h | 2 +-
parallel-checkout.c | 2 +-
t/t1051-large-conversion.sh | 2 +-
4 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/entry.c b/entry.c
index 711ee0693c7..4cb3942dbdc 100644
--- a/entry.c
+++ b/entry.c
@@ -82,11 +82,13 @@ static int create_file(const char *path, unsigned int mode)
return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
}
-void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
+void *read_blob_entry(const struct cache_entry *ce, size_t *size)
{
enum object_type type;
- void *blob_data = read_object_file(&ce->oid, &type, size);
+ unsigned long ul;
+ void *blob_data = read_object_file(&ce->oid, &type, &ul);
+ *size = ul;
if (blob_data) {
if (type == OBJ_BLOB)
return blob_data;
@@ -270,7 +272,7 @@ static int write_entry(struct cache_entry *ce, char *path, struct conv_attrs *ca
int fd, ret, fstat_done = 0;
char *new_blob;
struct strbuf buf = STRBUF_INIT;
- unsigned long size;
+ size_t size;
ssize_t wrote;
size_t newsize = 0;
struct stat st;
diff --git a/entry.h b/entry.h
index b8c0e170dc7..61ee8c17604 100644
--- a/entry.h
+++ b/entry.h
@@ -51,7 +51,7 @@ int finish_delayed_checkout(struct checkout *state, int *nr_checkouts);
*/
void unlink_entry(const struct cache_entry *ce);
-void *read_blob_entry(const struct cache_entry *ce, unsigned long *size);
+void *read_blob_entry(const struct cache_entry *ce, size_t *size);
int fstat_checkout_output(int fd, const struct checkout *state, struct stat *st);
void update_ce_after_write(const struct checkout *state, struct cache_entry *ce,
struct stat *st);
diff --git a/parallel-checkout.c b/parallel-checkout.c
index 6b1af32bb3d..b6f4a25642e 100644
--- a/parallel-checkout.c
+++ b/parallel-checkout.c
@@ -261,7 +261,7 @@ static int write_pc_item_to_fd(struct parallel_checkout_item *pc_item, int fd,
struct stream_filter *filter;
struct strbuf buf = STRBUF_INIT;
char *blob;
- unsigned long size;
+ size_t size;
ssize_t wrote;
/* Sanity check */
diff --git a/t/t1051-large-conversion.sh b/t/t1051-large-conversion.sh
index 7c1a2845005..5ba03d02682 100755
--- a/t/t1051-large-conversion.sh
+++ b/t/t1051-large-conversion.sh
@@ -85,7 +85,7 @@ test_expect_success 'ident converts on output' '
# This smudge filter prepends 5GB of zeros to the file it checks out. This
# ensures that smudging doesn't mangle large files on 64-bit Windows.
-test_expect_failure EXPENSIVE,!LONG_IS_64BIT 'files over 4GB convert on output' '
+test_expect_success EXPENSIVE,!LONG_IS_64BIT 'files over 4GB convert on output' '
test_commit test small "a small file" &&
test_config filter.makelarge.smudge \
"test-tool genzeros $((5*1024*1024*1024)) && cat" &&
--
gitgitgadget
