[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [qemu-xen master] display: cirrus: check vga bits per pixel(bpp) value
commit 4299b90e9ba9ce5ca9024572804ba751aa1a7e70 Author: Prasad J Pandit <pjp@xxxxxxxxxxxxxxxxx> AuthorDate: Tue Oct 18 13:15:17 2016 +0530 Commit: Gerd Hoffmann <kraxel@xxxxxxxxxx> CommitDate: Mon Dec 5 11:01:55 2016 +0100 display: cirrus: check vga bits per pixel(bpp) value In Cirrus CLGD 54xx VGA Emulator, if cirrus graphics mode is VGA, 'cirrus_get_bpp' returns zero(0), which could lead to a divide by zero error in while copying pixel data. The same could occur via blit pitch values. Add check to avoid it. Reported-by: Huawei PSIRT <psirt@xxxxxxxxxx> Signed-off-by: Prasad J Pandit <pjp@xxxxxxxxxxxxxxxxx> Message-id: 1476776717-24807-1-git-send-email-ppandit@xxxxxxxxxx Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> --- hw/display/cirrus_vga.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c index 3d712d5..bdb092e 100644 --- a/hw/display/cirrus_vga.c +++ b/hw/display/cirrus_vga.c @@ -272,6 +272,9 @@ static void cirrus_update_memory_access(CirrusVGAState *s); static bool blit_region_is_unsafe(struct CirrusVGAState *s, int32_t pitch, int32_t addr) { + if (!pitch) { + return true; + } if (pitch < 0) { int64_t min = addr + ((int64_t)s->cirrus_blt_height-1) * pitch; @@ -715,7 +718,7 @@ static int cirrus_bitblt_videotovideo_patterncopy(CirrusVGAState * s) s->cirrus_addr_mask)); } -static void cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h) +static int cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h) { int sx = 0, sy = 0; int dx = 0, dy = 0; @@ -729,6 +732,9 @@ static void cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h) int width, height; depth = s->vga.get_bpp(&s->vga) / 8; + if (!depth) { + return 0; + } s->vga.get_resolution(&s->vga, &width, &height); /* extra x, y */ @@ -783,6 +789,8 @@ static void cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h) cirrus_invalidate_region(s, s->cirrus_blt_dstaddr, s->cirrus_blt_dstpitch, s->cirrus_blt_width, s->cirrus_blt_height); + + return 1; } static int cirrus_bitblt_videotovideo_copy(CirrusVGAState * s) @@ -790,11 +798,9 @@ static int cirrus_bitblt_videotovideo_copy(CirrusVGAState * s) if (blit_is_unsafe(s)) return 0; - cirrus_do_copy(s, s->cirrus_blt_dstaddr - s->vga.start_addr, + return cirrus_do_copy(s, s->cirrus_blt_dstaddr - s->vga.start_addr, s->cirrus_blt_srcaddr - s->vga.start_addr, s->cirrus_blt_width, s->cirrus_blt_height); - - return 1; } /*************************************** -- generated by git-patchbot for /home/xen/git/qemu-xen.git#master _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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