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devtmpfs: Replace simple_strtoul with kstrtoint in mount_param

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Replace simple_strtoul() with the recommended kstrtoint() for parsing
the 'devtmpfs.mount=' boot parameter. Unlike simple_strtoul(), which
returns an unsigned long, kstrtoint() converts the string directly to
int and avoids implicit casting.

Check the return value of kstrtoint() and reject invalid values. This
adds error handling while preserving behavior for existing values, and
removes use of the deprecated simple_strtoul() helper. The current code
silently sets 'mount_dev = 0' if parsing fails, instead of leaving the
default value (IS_ENABLED(CONFIG_DEVTMPFS_MOUNT)) unchanged.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://patch.msgid.link/20251220125930.76836-2-thorsten.blum@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thorsten Blum 2025-12-20 13:59:31 +01:00 • committed by Greg Kroah-Hartman
parent 99aa03f98c
commit 5f62af9fd2
1 changed files with 1 additions and 2 deletions
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3
drivers/base/devtmpfs.c
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@ -56,8 +56,7 @@ static struct req {
static int __init mount_param(char *str)
{
mount_dev = simple_strtoul(str, NULL, 0);
return 1;
return kstrtoint(str, 0, &mount_dev) == 0;
}
__setup("devtmpfs.mount=", mount_param);