[PATCH] l2fwd-crypto: fix coverity defect

[PATCH] l2fwd-crypto: fix coverity defect

[Pablo de Lara]

When parsing crypto device type, the string was being copied
with strcpy(), which could overflow the destination buffer
(which is 32 byte long), so snprintf() should be used instead.

This fixes coverity issue 124575:

/examples/l2fwd-crypto/main.c: 1005 in l2fwd_crypto_parse_args_long_options()
*** CID 124575:    (STRING_OVERFLOW)
999
1000     	/* Authentication options */
1001     	else if (strcmp(lgopts[option_index].name, "auth_algo") == 0) {
1002     		retval = parse_auth_algo(&options->auth_xform.auth.algo,
1003     				optarg);
1004     		if (retval == 0)
>>>     CID 124575:    (STRING_OVERFLOW)
>>>     You might overrun the 32 byte fixed-size string "options->string_auth_algo" by copying "optarg" without checking the length.
1005     			strcpy(options->string_auth_algo, optarg);
1006     		return retval;
1007     	}

Fixes: commit 49f79e86480d ("examples/l2fwd-crypto: add missing string initialization")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 examples/l2fwd-crypto/main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/examples/l2fwd-crypto/main.c b/examples/l2fwd-crypto/main.c
index 182dc56..d4e2d8d 100644
--- a/examples/l2fwd-crypto/main.c
+++ b/examples/l2fwd-crypto/main.c
@@ -1012,7 +1012,8 @@ l2fwd_crypto_parse_args_long_options(struct l2fwd_crypto_options *options,
 	if (strcmp(lgopts[option_index].name, "cdev_type") == 0) {
 		retval = parse_cryptodev_type(&options->type, optarg);
 		if (retval == 0)
-			strcpy(options->string_type, optarg);
+			snprintf(options->string_type, MAX_STR_LEN,
+				"%s", optarg);
 		return retval;
 	}
 
-- 
2.5.5

Re: [PATCH] l2fwd-crypto: fix coverity defect

[Declan Doherty]

On 07/04/16 14:23, Pablo de Lara wrote:
> When parsing crypto device type, the string was being copied
> with strcpy(), which could overflow the destination buffer
> (which is 32 byte long), so snprintf() should be used instead.
>
> This fixes coverity issue 124575:
>
> /examples/l2fwd-crypto/main.c: 1005 in l2fwd_crypto_parse_args_long_options()
> *** CID 124575:    (STRING_OVERFLOW)
> 999
> 1000     	/* Authentication options */
> 1001     	else if (strcmp(lgopts[option_index].name, "auth_algo") == 0) {
> 1002     		retval = parse_auth_algo(&options->auth_xform.auth.algo,
> 1003     				optarg);
> 1004     		if (retval == 0)
>>>>      CID 124575:    (STRING_OVERFLOW)
>>>>      You might overrun the 32 byte fixed-size string "options->string_auth_algo" by copying "optarg" without checking the length.
> 1005     			strcpy(options->string_auth_algo, optarg);
> 1006     		return retval;
> 1007     	}
>
> Fixes: commit 49f79e86480d ("examples/l2fwd-crypto: add missing string initialization")
>
> Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
> ---
...
>
Acked-by: Declan Doherty <declan.doherty@intel.com>

Re: [PATCH] l2fwd-crypto: fix coverity defect

[Thomas Monjalon]

> > When parsing crypto device type, the string was being copied
> > with strcpy(), which could overflow the destination buffer
> > (which is 32 byte long), so snprintf() should be used instead.
> >
> > This fixes coverity issue 124575:
[...]
> > Fixes: commit 49f79e86480d ("examples/l2fwd-crypto: add missing string initialization")
> >
> > Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
> >
> Acked-by: Declan Doherty <declan.doherty@intel.com>

Applied, thanks