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vt/consolemap: do font sum unsigned

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[ Upstream commit 9777f8e60e718f7b022a94f2524f967d8def1931 ]

The constant 20 makes the font sum computation signed which can lead to
sign extensions and signed wraps. It's not much of a problem as we build
with -fno-strict-overflow. But if we ever decide not to, be ready, so
switch the constant to unsigned.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210105120239.28031-7-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Slaby 2021-01-05 13:02:34 +01:00 committed by Greg Kroah-Hartman
parent e0c29b368d
commit 136f009b2a
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/vt/consolemap.c
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@ -495,7 +495,7 @@ con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos)
p2[unicode & 0x3f] = fontpos;
p->sum += (fontpos << 20) + unicode;
p->sum += (fontpos << 20U) + unicode;
return 0;
}