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829329bddb
Catch the case where we have a font so big that it causes the number of rows or columns to be 0. Currently we continue and allocate a virtual_screen.text_buffer of size 0. We then try to use that for glpyhs and things go badly. On the emu platform, malloc() may give us a valid pointer, in which case we'll access heap memory which we shouldn't. Alternatively, it may give us NULL, in which case we'll crash. For other platforms, if I understand grub_memalign() correctly, we will receive a valid but small allocation that we will very likely later overrun. Prevent the creation of a virtual screen that isn't at least 40 cols by 12 rows. This is arbitrary, but it seems that if your width or height is half a standard 80x24 terminal, you're probably going to struggle to read anything anyway. Signed-off-by: Daniel Axtens <dja@axtens.net> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> |
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| .. | ||
| arc | ||
| arm | ||
| efi | ||
| i386 | ||
| ieee1275 | ||
| uboot | ||
| xen | ||
| at_keyboard.c | ||
| gfxterm_background.c | ||
| gfxterm.c | ||
| morse.c | ||
| ns8250.c | ||
| ps2.c | ||
| serial.c | ||
| spkmodem.c | ||
| terminfo.c | ||
| tparm.c | ||
| usb_keyboard.c | ||