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drivers/of: fdt: validate stdout-path properties before parsing them

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early_init_dt_scan_chosen_stdout() fetches stdout-path and
linux,stdout-path directly from the flat DT and immediately passes the
result to strchrnul(). Flat DT properties are raw firmware-supplied
byte sequences, and this path does not prove that either property is
NUL-terminated within its declared bounds.

Use fdt_stringlist_get() so malformed unterminated stdout-path
properties are rejected before the local parser walks them as C
strings.

Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Link: https://patch.msgid.link/20260403143001.1-dt-fdt-stdout-pengpeng@iscas.ac.cn
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
This commit is contained in:
Pengpeng Hou 2026-04-03 11:55:29 +08:00 committed by Rob Herring (Arm)
parent 38fe537950
commit bb04fcc89a
1 changed files with 2 additions and 2 deletions
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4
drivers/of/fdt.c
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@ -954,9 +954,9 @@ int __init early_init_dt_scan_chosen_stdout(void)
if (offset < 0)
return -ENOENT;
p = fdt_getprop(fdt, offset, "stdout-path", &l);
p = fdt_stringlist_get(fdt, offset, "stdout-path", 0, &l);
if (!p)
p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);
p = fdt_stringlist_get(fdt, offset, "linux,stdout-path", 0, &l);
if (!p || !l)
return -ENOENT;