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fbcon: Fix boundary checks for fbcon=vc:n1-n2 parameters
commit cad564ca55
upstream.
The user may use the fbcon=vc:<n1>-<n2> option to tell fbcon to take
over the given range (n1...n2) of consoles. The value for n1 and n2
needs to be a positive number and up to (MAX_NR_CONSOLES - 1).
The given values were not fully checked against those boundaries yet.
To fix the issue, convert first_fb_vc and last_fb_vc to unsigned
integers and check them against the upper boundary, and make sure that
first_fb_vc is smaller than last_fb_vc.
Cc: stable@vger.kernel.org # v4.19+
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/YpkYRMojilrtZIgM@p100
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
4fff6401ba
commit
665df39ab2
1 changed files with 5 additions and 3 deletions
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@ -115,8 +115,8 @@ static int logo_lines;
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enums. */
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static int logo_shown = FBCON_LOGO_CANSHOW;
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/* console mappings */
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static int first_fb_vc;
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static int last_fb_vc = MAX_NR_CONSOLES - 1;
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static unsigned int first_fb_vc;
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static unsigned int last_fb_vc = MAX_NR_CONSOLES - 1;
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static int fbcon_is_default = 1;
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static int primary_device = -1;
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static int fbcon_has_console_bind;
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@ -464,10 +464,12 @@ static int __init fb_console_setup(char *this_opt)
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options += 3;
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if (*options)
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first_fb_vc = simple_strtoul(options, &options, 10) - 1;
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if (first_fb_vc < 0)
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if (first_fb_vc >= MAX_NR_CONSOLES)
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first_fb_vc = 0;
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if (*options++ == '-')
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last_fb_vc = simple_strtoul(options, &options, 10) - 1;
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if (last_fb_vc < first_fb_vc || last_fb_vc >= MAX_NR_CONSOLES)
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last_fb_vc = MAX_NR_CONSOLES - 1;
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fbcon_is_default = 0;
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continue;
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}
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