From cb0ed522a51a7d4b1fde535972d4aeeb82447928 Mon Sep 17 00:00:00 2001 From: Stefan Weil Date: Tue, 10 Sep 2024 07:41:38 +0200 Subject: [PATCH] migration/multifd: Fix loop conditions in multifd_zstd_send_prepare and multifd_zstd_recv GitHub's CodeQL reports four critical errors which are fixed by this commit: Unsigned difference expression compared to zero An expression (u - v > 0) with unsigned values u, v is only false if u == v, so all changed expressions did not work as expected. Signed-off-by: Stefan Weil Link: https://lore.kernel.org/r/20240910054138.1458555-1-sw@weilnetz.de [peterx: Fix mangled email for author] Signed-off-by: Peter Xu --- migration/multifd-zstd.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c index 53da33e048..abed140855 100644 --- a/migration/multifd-zstd.c +++ b/migration/multifd-zstd.c @@ -123,9 +123,9 @@ static int multifd_zstd_send_prepare(MultiFDSendParams *p, Error **errp) */ do { ret = ZSTD_compressStream2(z->zcs, &z->out, &z->in, flush); - } while (ret > 0 && (z->in.size - z->in.pos > 0) - && (z->out.size - z->out.pos > 0)); - if (ret > 0 && (z->in.size - z->in.pos > 0)) { + } while (ret > 0 && (z->in.size > z->in.pos) + && (z->out.size > z->out.pos)); + if (ret > 0 && (z->in.size > z->in.pos)) { error_setg(errp, "multifd %u: compressStream buffer too small", p->id); return -1; @@ -243,7 +243,7 @@ static int multifd_zstd_recv(MultiFDRecvParams *p, Error **errp) */ do { ret = ZSTD_decompressStream(z->zds, &z->out, &z->in); - } while (ret > 0 && (z->in.size - z->in.pos > 0) + } while (ret > 0 && (z->in.size > z->in.pos) && (z->out.pos < page_size)); if (ret > 0 && (z->out.pos < page_size)) { error_setg(errp, "multifd %u: decompressStream buffer too small", -- 2.30.2