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| author | Defang Bo <bodefang@126.com> | 2020-10-19 19:38:58 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-10-20 17:06:22 -0700 |
| commit | 280e3ebdafb863b3cb50d5842f056267e15bf40c (patch) | |
| tree | eff2e1c1f6e5dead99c938c2b9d92485b569e705 /net | |
| parent | b142083b585c2c03af24cca4d274f797796a4064 (diff) | |
| download | linux-280e3ebdafb863b3cb50d5842f056267e15bf40c.tar.gz linux-280e3ebdafb863b3cb50d5842f056267e15bf40c.tar.bz2 linux-280e3ebdafb863b3cb50d5842f056267e15bf40c.zip | |
nfc: Ensure presence of NFC_ATTR_FIRMWARE_NAME attribute in nfc_genl_fw_download()
Check that the NFC_ATTR_FIRMWARE_NAME attributes are provided by
the netlink client prior to accessing them.This prevents potential
unhandled NULL pointer dereference exceptions which can be triggered
by malicious user-mode programs, if they omit one or both of these
attributes.
Similar to commit a0323b979f81 ("nfc: Ensure presence of required attributes in the activate_target handler").
Fixes: 9674da8759df ("NFC: Add firmware upload netlink command")
Signed-off-by: Defang Bo <bodefang@126.com>
Link: https://lore.kernel.org/r/1603107538-4744-1-git-send-email-bodefang@126.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/nfc/netlink.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c index e894254c17d4..8709f3d4e7c4 100644 --- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -1217,7 +1217,7 @@ static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info) u32 idx; char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1]; - if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) + if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME]) return -EINVAL; idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); |