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| author | David Herrmann <dh.herrmann@gmail.com> | 2015-01-15 12:38:57 +0100 |
|---|---|---|
| committer | David Herrmann <dh.herrmann@gmail.com> | 2015-01-15 14:13:49 +0100 |
| commit | 975a900782528b57deafadc10457c7ffab0b9791 (patch) | |
| tree | df9ecc2143f9a6af383d9180d3667ee15b44a6c7 | |
| parent | 5e2de0eb1dff7bb86b40c16a0a9c9c4de33e77d1 (diff) | |
udev: fix NULL-ptr deref
Make sure we properly validate the return value of
udev_device_get_sysattr_value(). It might be NULL for several reasons.
| -rw-r--r-- | src/udev/udev-builtin-input_id.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/udev/udev-builtin-input_id.c b/src/udev/udev-builtin-input_id.c index a3289128b3..e6fd077260 100644 --- a/src/udev/udev-builtin-input_id.c +++ b/src/udev/udev-builtin-input_id.c @@ -4,6 +4,7 @@ * Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com> * Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk> * Copyright (C) 2011 Kay Sievers <kay@vrfy.org> + * Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -48,12 +49,17 @@ static void get_cap_mask(struct udev_device *dev, struct udev_device *pdev, const char* attr, unsigned long *bitmask, size_t bitmask_size, bool test) { + const char *v; char text[4096]; unsigned i; char* word; unsigned long val; - snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(pdev, attr)); + v = udev_device_get_sysattr_value(pdev, attr); + if (!v) + v = ""; + + snprintf(text, sizeof(text), "%s", v); log_debug("%s raw kernel attribute: %s", attr, text); memzero(bitmask, bitmask_size); |