scalar-diagnose: avoid 32-bit overflow of size_t
Avoid 32-bit size_t overflow when reporting the available disk space in 'get_disk_info' by casting the block size and available block count to 'off_t' before multiplying them. Without this change, 'st_mult' would (correctly) report a size_t overflow on 32-bit systems at or exceeding 2^32 bytes of available space. Note that 'off_t' is a 64-bit integer even on 32-bit systems due to the inclusion of '#define _FILE_OFFSET_BITS 64' in 'git-compat-util.h' (see b97e911643 (Support for large files on 32bit systems., 2007-02-17)). Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Victoria Dye <vdye@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Victoria Dye committed
Aug 12, 2022 at 20:10 UTC
91be401945a58c95a61c94bd5ab5ed25d143803d
1 file changed
+1
-1
contrib/scalar/scalar.c
+1
-1
index 97e71fe19c..0404645228 100644
--- a/contrib/scalar/scalar.c
+++ b/contrib/scalar/scalar.c
@@ -348,7 +348,7 @@ static int get_disk_info(struct strbuf *out)
}
strbuf_addf(out, "Available space on '%s': ", buf.buf);
- strbuf_humanise_bytes(out, st_mult(stat.f_bsize, stat.f_bavail));
+ strbuf_humanise_bytes(out, (off_t)stat.f_bsize * (off_t)stat.f_bavail);
strbuf_addf(out, " (mount flags 0x%lx)\n", stat.f_flag);
strbuf_release(&buf);
#endif