Re: [PATCH] sha1_file: don't convert off_t to size_t too early to avoid potential die()

Steffen Prohaska [off-list ref] writes:

xsize_t() checks if an off_t argument can be safely converted to
a size_t return value.  If the check is executed too early, it could
fail for large files on 32-bit architectures even if the size_t code
path is not taken.  Other paths might be able to handle the large file.
Specifically, index_stream_convert_blob() is able to handle a large file
if a filter is configured that returns a small result.

Signed-off-by: Steffen Prohaska <redacted>
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This patch should be applied on top of sp/stream-clean-filter.

index_stream() might internally also be able to handle large files to
some extent.  But it uses size_t for its third argument, and we must
already die() when calling it.  It might be a good idea to convert its
interface to use off_t and push the size checks further down the stack.

Yes, if we want to futz in this area, I think that would be the
right approach.