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cb4213b43b
commit e64242caef18b4a5840b0e7a9bff37abd4f4f933 upstream. We need to prevent that users configure a screen size which is smaller than the currently selected font size. Otherwise rendering chars on the screen will access memory outside the graphics memory region. This patch adds a new function fbcon_modechange_possible() which implements this check and which later may be extended with other checks if necessary. The new function is called from the FBIOPUT_VSCREENINFO ioctl handler in fbmem.c, which will return -EINVAL if userspace asked for a too small screen size. Signed-off-by: Helge Deller <deller@gmx.de> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Hugo SIMELIERE <hsimeliere.opensource@witekio.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> (cherry picked from commit 54eaaac622d4547b4abae7e44763b29fa0687132) Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
17 lines
492 B
C
17 lines
492 B
C
#ifndef _LINUX_FBCON_H
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#define _LINUX_FBCON_H
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#ifdef CONFIG_FRAMEBUFFER_CONSOLE
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void __init fb_console_init(void);
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void __exit fb_console_exit(void);
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int fbcon_modechange_possible(struct fb_info *info,
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struct fb_var_screeninfo *var);
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#else
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static inline void fb_console_init(void) {}
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static inline void fb_console_exit(void) {}
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static inline int fbcon_modechange_possible(struct fb_info *info,
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struct fb_var_screeninfo *var) { return 0; }
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#endif
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#endif /* _LINUX_FBCON_H */
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