In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
media: s2255: bound JPEG frame size before copying into the buffer<\/p>\n
s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPEG\/MJPEG
\nframe into the vb2 plane. vc->jpg_size is taken verbatim from the
\nS2255_MARKER_FRAME header the device sends (pdword[4] in save_frame())
\nand, unlike the frame payload length just above it, is never bounded:<\/p>\n
\tpayload = le32_to_cpu(pdword[3]);
\n\tif (payload > vc->req_image_size)\t\/* payload is checked … *\/
\n\t\treturn -EINVAL;
\n\tvc->pkt_size = payload;
\n\tvc->jpg_size = le32_to_cpu(pdword[4]);\t\/* … jpg_size is not *\/<\/p>\n
A malicious or malfunctioning device can therefore report a jpg_size
\nlarger than the destination vb2 plane, and the memcpy() writes past it.
\njpg_size is a signed int, so a value with the top bit set also turns
\ninto a huge length.<\/p>\n
Reject a frame whose jpg_size is negative or exceeds the plane size
\nbefore copying it.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
media: s2255: bound JPEG frame size before copying into the buffer<\/p>\n
s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPE<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24566","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}