In the Linux kernel, the following vulnerability has been resolved:
fbdev: modedb: fix a possible UAF in fb_find_mode()
If mode_option is NULL, it is assigned from mode_option_buf:
if (!mode_option) { fb_get_options(NULL, &mode_option_buf); mode_option = mode_option_buf; }
Later, name is assigned from mode_option:
const char *name = mode_option;
However, mode_option_buf is freed before name is no longer used:
kfree(mode_option_buf);
while name is still accessed by:
if ((name_matches(db[i], name, namelen) ||
Since name aliases mode_option_buf, this may result in a use-after-free.
Fix this by extending the lifetime of mode_option_buf until the end of the function by using scope-based resource management for cleanup.