Date: Sat, 25 Sep 2021 18:14:43 GMT From: Ed Maste <emaste@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: e4fcff8ee124 - stable/12 - vt: bound buffer access in redraw optimization Message-ID: <202109251814.18PIEhol079969@gitrepo.freebsd.org>
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The branch stable/12 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=e4fcff8ee124f8faed2f1fcc1e15b7ae6906d4d7 commit e4fcff8ee124f8faed2f1fcc1e15b7ae6906d4d7 Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2021-09-22 18:41:00 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2021-09-25 16:32:06 +0000 vt: bound buffer access in redraw optimization PR: 248628 Reported by: oleg Reviewed by: cem, oleg (both earlier) Fixes: ee97b2336aa4 ("Speed up vt(4) by keeping...") MFC after: 3 days Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32059 (cherry picked from commit dbc7ca59451561a179f9852642e13ef024169d84) --- sys/dev/vt/hw/fb/vt_fb.c | 6 ++++++ sys/dev/vt/hw/vga/vt_vga.c | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/sys/dev/vt/hw/fb/vt_fb.c b/sys/dev/vt/hw/fb/vt_fb.c index 62a52dd9e017..5c14be1c15ba 100644 --- a/sys/dev/vt/hw/fb/vt_fb.c +++ b/sys/dev/vt/hw/fb/vt_fb.c @@ -354,6 +354,9 @@ vt_fb_bitblt_text(struct vt_device *vd, const struct vt_window *vw, VTBUF_ISCURSOR(&vw->vw_buf, row, col), &fg, &bg); z = row * PIXEL_WIDTH(VT_FB_MAX_WIDTH) + col; + if (z >= PIXEL_HEIGHT(VT_FB_MAX_HEIGHT) * + PIXEL_WIDTH(VT_FB_MAX_WIDTH)) + continue; if (vd->vd_drawn && (vd->vd_drawn[z] == c) && vd->vd_drawnfg && (vd->vd_drawnfg[z] == fg) && vd->vd_drawnbg && (vd->vd_drawnbg[z] == bg)) @@ -404,6 +407,9 @@ vt_fb_invalidate_text(struct vt_device *vd, const term_rect_t *area) for (col = area->tr_begin.tp_col; col < area->tr_end.tp_col; ++col) { z = row * PIXEL_WIDTH(VT_FB_MAX_WIDTH) + col; + if (z >= PIXEL_HEIGHT(VT_FB_MAX_HEIGHT) * + PIXEL_WIDTH(VT_FB_MAX_WIDTH)) + continue; if (vd->vd_drawn) vd->vd_drawn[z] = 0; if (vd->vd_drawnfg) diff --git a/sys/dev/vt/hw/vga/vt_vga.c b/sys/dev/vt/hw/vga/vt_vga.c index 88a9b1c47338..563867399e53 100644 --- a/sys/dev/vt/hw/vga/vt_vga.c +++ b/sys/dev/vt/hw/vga/vt_vga.c @@ -888,6 +888,9 @@ vga_bitblt_text_txtmode(struct vt_device *vd, const struct vt_window *vw, &fg, &bg); z = row * PIXEL_WIDTH(VT_FB_MAX_WIDTH) + col; + if (z >= PIXEL_HEIGHT(VT_FB_MAX_HEIGHT) * + PIXEL_WIDTH(VT_FB_MAX_WIDTH)) + continue; if (vd->vd_drawn && (vd->vd_drawn[z] == c) && vd->vd_drawnfg && (vd->vd_drawnfg[z] == fg) && vd->vd_drawnbg && (vd->vd_drawnbg[z] == bg)) @@ -941,6 +944,9 @@ vga_invalidate_text(struct vt_device *vd, const term_rect_t *area) col < area->tr_end.tp_col; ++col) { z = row * PIXEL_WIDTH(VT_FB_MAX_WIDTH) + col; + if (z >= PIXEL_HEIGHT(VT_FB_MAX_HEIGHT) * + PIXEL_WIDTH(VT_FB_MAX_WIDTH)) + continue; if (vd->vd_drawn) vd->vd_drawn[z] = 0; if (vd->vd_drawnfg)
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