From: Victoria Dye <vdye@xxxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Victoria Dye <vdye@xxxxxxxxxx> --- contrib/scalar/scalar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/contrib/scalar/scalar.c b/contrib/scalar/scalar.c index 97e71fe19cd..04046452284 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 -- gitgitgadget
