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Sat, 01 Aug 2020 15:14:00 +0200 From: Helge Deller To: qemu-devel@nongnu.org, peter.maydell@linaro.org Subject: [PATCH v2 4/4] hw/display/artist.c: fix out of bounds check Date: Sat, 1 Aug 2020 15:13:57 +0200 Message-Id: <20200801131357.17379-5-deller@gmx.de> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200801131357.17379-1-deller@gmx.de> References: <20200801131357.17379-1-deller@gmx.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:njv7tqexMyNbrMNn86E9YFp9RkiX30uhc2lvd+KK+I3KjEz5ct6 Hyk4NdkEsxdXnNUBSOEkSp+g94cdiAY0I6IAnRjQF8FcQwZTWo1fimi52rmNQBSJZVEwRLR El0tU3RCPpwCGGb0NIfgY8DkCgk3Q8tQW/UeNVM2uOHV6KBhpAiBmLSXiMdxG3I2LSwpJhV 5sqPt8EipOM//8Rxu0sZw== X-UI-Out-Filterresults: notjunk:1;V03:K0:QvHX9IehykM=:FV43a9TWk/12EKDqGBB0uu H1AWb2JnogT1iJ3eUZBpRJpMHGFHlb9ykYT+bOKp2/sWsO53iC77rX2vGWhAP//L8/IZQBQg2 kZyA4dB8xdsFY04faxZIdvXceqUYYSmcZSYnxtrxONx7R/xiAyVK2Blo3YPD5S6ILPLeKSsf4 n+B2bLn5VYUzpu4H+yTqk99odSVLZ8yoek+Tk+mpQeAeSMMLaqo0TqTNIlIkNn0faImXq6iWW 9PZgSNJ41sh9Etu35efO+PnvyeXXwGHRXDshMoDIZYjxQSfmQPazLarGzbvu3tIDxGiO3vWPx cXRCnkVU4hMy2pScJS3PNTOCUlMO2mbHtcCMyGAblw3Rd2rEJU1udYqyMyLQ0Y9sCIIuayxQ/ lKb3yOzeo8nf7Di4+GAEh5YBWdABRPvgxONFmMf7oNxhqesgPPzGJLnBB3SznMXSlyiKWrehX 073ylA3H0MuejOnq6dw2O/3tKY9yY4Zf/irJLJRhvrCVA4t10SEHAdO/WZl02ncSeB3X9U8zM A0qnKQ/rDZihJFOgdS3NYUJkB05jj7OLMO7lxdlZBCHvZqh52bgEIMrqnLrLyWBgR0YsEUM3E 8CeSkkXIZYWTWtvLU3XLS/wy99QmyqlmjwvHWHPL3fgmaDtK9g11mzb/rGRLkALiLqU5wwaR9 HEitB7EPEqbu6N3zJyTH5lTuyc3WCs8jKljPxa4C3lZ5h+gbKAuDhSLYPt7I8iGVxyDJY4ylH M/vBhGXlumfuunHYGrEDgxpm9wrbWTZuGa2TJaQ6989TMuTcdeYW5e+sKL3XSCURLHwKDlGoG 7qbVVyJJqGDlVew7nNKKFr7xQHoRYQ7lyKNIUseT6/U/EFKJplQiZxXNjOyLcKJHFWwSl02e7 Dc+hQlLkZkw/zYGeyERpUqj5FJ4iN8eK+5yd8eKxQCdNaPsCSlR28Q0qzisdnlv1Xe+pjJ+uL GLPe67SbLQX35ML/AkPzc/qQokKewSixgIUtQMU/XFmx2z/s3dIi63RRNYzEU8MrlPVRHR+nD Cs2yvyv6W6EhBGmeKLwVXXTboIllj4ywUydRHVhYgqtjiUwsRy2cSDJhAPSDsmat++M3Ysn32 vlH9LWhB8hBdmjQgojMTvqLvCBzRISlkI1dWcGfe1Q54DslB3FOYO2FqbzdEBgQPX+KvbsrcI XxMmtoYfjmY5OqhuXONXPqcXRAhtNqaZxM2SXVoqDzs6amoYSZAGYzIdonzepD0VT6K27raaw R2LqXApe1m7Ho0/KP Received-SPF: pass client-ip=212.227.15.15; envelope-from=deller@gmx.de; helo=mout.gmx.net X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/01 09:14:03 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Helge Deller , Sven Schnelle , Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Sven Schnelle Signed-off-by: Sven Schnelle Signed-off-by: Helge Deller Reviewed-by: Richard Henderson --- hw/display/artist.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-) -- 2.21.3 diff --git a/hw/display/artist.c b/hw/display/artist.c index 6261bfe65b..de56200dbf 100644 --- a/hw/display/artist.c +++ b/hw/display/artist.c @@ -340,14 +340,13 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x, { struct vram_buffer *buf; uint32_t vram_bitmask = s->vram_bitmask; - int mask, i, pix_count, pix_length, offset, height, width; + int mask, i, pix_count, pix_length, offset, width; uint8_t *data8, *p; pix_count = vram_write_pix_per_transfer(s); pix_length = vram_pixel_length(s); buf = vram_write_buffer(s); - height = buf->height; width = buf->width; if (s->cmap_bm_access) { @@ -367,13 +366,6 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x, pix_count = size * 8; } - if (posy * width + posx + pix_count > buf->size) { - qemu_log("write outside bounds: wants %dx%d, max size %dx%d\n", - posx, posy, width, height); - return; - } - - switch (pix_length) { case 0: if (s->image_bitmap_op & 0x20000000) { @@ -381,8 +373,11 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x, } for (i = 0; i < pix_count; i++) { - artist_rop8(s, p + offset + pix_count - 1 - i, - (data & 1) ? (s->plane_mask >> 24) : 0); + uint32_t off = offset + pix_count - 1 - i; + if (off < buf->size) { + artist_rop8(s, p + off, + (data & 1) ? (s->plane_mask >> 24) : 0); + } data >>= 1; } memory_region_set_dirty(&buf->mr, offset, pix_count); @@ -398,7 +393,10 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x, for (i = 3; i >= 0; i--) { if (!(s->image_bitmap_op & 0x20000000) || s->vram_bitmask & (1 << (28 + i))) { - artist_rop8(s, p + offset + 3 - i, data8[ROP8OFF(i)]); + uint32_t off = offset + 3 - i; + if (off < buf->size) { + artist_rop8(s, p + off, data8[ROP8OFF(i)]); + } } } memory_region_set_dirty(&buf->mr, offset, 3); @@ -420,7 +418,7 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x, break; } - for (i = 0; i < pix_count; i++) { + for (i = 0; i < pix_count && offset + i < buf->size; i++) { mask = 1 << (pix_count - 1 - i); if (!(s->image_bitmap_op & 0x20000000) ||