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[PATCH 5/5] video/vesa: harden font height parsing
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 24 Mar 2026 17:39:12 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Kamil Frankowicz <kamil.frankowicz@xxxxxxx>
- Delivery-date: Tue, 24 Mar 2026 16:39:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
We should not prematurely increment the pointer, to avoid inadvertently
skipping the NUL terminator.
Fixes: 6d9199bd0f22 ("x86-64: enable hypervisor output on VESA frame buffer")
Reported-by: Kamil Frankowicz <kamil.frankowicz@xxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/drivers/video/vesa.c
+++ b/xen/drivers/video/vesa.c
@@ -31,8 +31,8 @@ static unsigned int __initdata vram_rema
static unsigned int __initdata font_height;
static int __init cf_check parse_font_height(const char *s)
{
- if ( simple_strtoul(s, &s, 10) == 8 && (*s++ == 'x') )
- font_height = simple_strtoul(s, &s, 10);
+ if ( simple_strtoul(s, &s, 10) == 8 && (*s == 'x') )
+ font_height = simple_strtoul(s + 1, &s, 10);
if ( *s != '\0' )
font_height = 0;
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