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fbcon: fix rotate upside down crash

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Fix the rotate_ud() function not to crash in case of a font which has not
a width of multiple by 8: The inner loop of the font pixel copy should not
access a bit outside the font memory area.  Subtract the shift offset from
the font width will prevent this.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefani Seibold 2009-08-06 15:07:30 -07:00 committed by Linus Torvalds
parent 69dd647f96
commit 93274e4d4e
1 changed files with 1 additions and 1 deletions
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2
drivers/video/console/fbcon_rotate.h
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@ -45,7 +45,7 @@ static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
width = (width + 7) & ~7; width = (width + 7) & ~7;
for (i = 0; i < height; i++) { for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) { for (j = 0; j < width - shift; j++) {
if (pattern_test_bit(j, i, width, in)) if (pattern_test_bit(j, i, width, in))
pattern_set_bit(width - (1 + j + shift), pattern_set_bit(width - (1 + j + shift),
height - (1 + i), height - (1 + i),