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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1745942226; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=QxSeVOzh1ZOvQlc8005PTafUjWamVAoMPx8ZyD71PAk=; b=Rv8fYrZE0vSAkpFreotbBa+fwxVXvCcW2jBbMJCxi8tA+fW7rYJZwoyQpEWs3JEZWgVITF JerCeeONFf4BkoM5SI6KOOjc/FacETvCNnpUGI2JCuKFdXOUqfjCutBRXOGwpy6VpyxZCm q45zkz0otBlKdhhDkVrKzmKLEGGNz/0= X-MC-Unique: 7ecH-6JrOcWkxgsxJIZdmg-1 X-Mimecast-MFC-AGG-ID: 7ecH-6JrOcWkxgsxJIZdmg_1745942218 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org Subject: [PATCH] file-posix: Fix crash on discard_granularity == 0 Date: Tue, 29 Apr 2025 17:56:54 +0200 Message-ID: <20250429155654.102735-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" Block devices that don't support discard have a discard_granularity of 0. Currently, this results in a division by zero when we try to make sure that it's a multiple of request_alignment. Only try to update bs->bl.pdiscard_alignment when we got a non-zero discard_granularity from sysfs. Fixes: f605796aae4 ('file-posix: probe discard alignment on Linux block dev= ices') Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Reviewed-by: Stefan Hajnoczi --- block/file-posix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/file-posix.c b/block/file-posix.c index 0d6e12f880..0d85123d0f 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1573,7 +1573,7 @@ static void raw_refresh_limits(BlockDriverState *bs, = Error **errp) int ret; =20 ret =3D hdev_get_pdiscard_alignment(&st, &dalign); - if (ret =3D=3D 0) { + if (ret =3D=3D 0 && dalign !=3D 0) { uint32_t ralign =3D bs->bl.request_alignment; =20 /* Probably never happens, but handle it just in case */ --=20 2.49.0