[dpdk-dev] [PATCH v6 02/16] net/nfp: solve buffer overflow

[Andy Green <andy@warmcat.com>]

/home/agreen/projects/dpdk/drivers/net/nfp/nfp_net.c: In
function ‘nfp_pf_pci_probe’:
/home/agreen/projects/dpdk/drivers/net/nfp/nfp_net.c:3160:
23: error: ‘%s’ directive writing up to 99 bytes into a
region of size 76 [-Werror=format-overflow=]
  sprintf(fw_name, "%s/%s.nffw", DEFAULT_FW_PATH, serial);

Note fw_buf still has to increase somewhat even after
restricting serial[], since otherwise:

/home/agreen/projects/dpdk/drivers/net/nfp/nfp_net.c: In
function ‘nfp_pf_pci_probe’:
/home/agreen/projects/dpdk/drivers/net/nfp/nfp_net.c:3176:23:
error: ‘%s’ directive writing up to 99 bytes into a region
of size 76 [-Werror=format-overflow=]
  sprintf(fw_name, "%s/%s", DEFAULT_FW_PATH, card);
                       ^~
/home/agreen/projects/dpdk/drivers/net/nfp/nfp_net.c:3262:32:
  err = nfp_fw_upload(dev, nsp, card_desc);
                                ~~~~~~~~~
/home/agreen/projects/dpdk/drivers/net/nfp/nfp_net.c:3176:2:
note: ‘sprintf’ output between 25 and 124 bytes into a
destination of size 100
  sprintf(fw_name, "%s/%s", DEFAULT_FW_PATH, card);

Signed-off-by: Andy Green <andy@warmcat.com>
Fixes: 896c265ef954 ("net/nfp: use new CPP interface")
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 drivers/net/nfp/nfp_net.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index 048324ec9..78113b41b 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -3144,8 +3144,8 @@ nfp_fw_upload(struct rte_pci_device *dev, struct nfp_nsp *nsp, char *card)
 	struct nfp_cpp *cpp = nsp->cpp;
 	int fw_f;
 	char *fw_buf;
-	char fw_name[100];
-	char serial[100];
+	char fw_name[125];
+	char serial[40];
 	struct stat file_stat;
 	off_t fsize, bytes;