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fbsplash: use virtual y size in mmap size calculations

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The virtual y can be larger - and we can be even writing there since
we are taking into account the y offset. Avoids possible crash.
But use it only if set, seems it is not set if virtual area is not
allocated (though, often fbcon allocates some scrollback area).

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Timo Teräs 2015-10-26 09:40:31 +02:00 committed by Denys Vlasenko
parent cddc98eab7
commit 82c2fad26c
1 changed files with 1 additions and 1 deletions
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2
miscutils/fbsplash.c
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@ -150,7 +150,7 @@ static void fb_open(const char *strfb_device)
// map the device in memory
G.addr = mmap(NULL,
G.scr_var.yres * G.scr_fix.line_length,
(G.scr_var.yres_virtual ?: G.scr_var.yres) * G.scr_fix.line_length,
PROT_WRITE, MAP_SHARED, fbfd, 0);
if (G.addr == MAP_FAILED)
bb_perror_msg_and_die("mmap");