Re: [PATCH 1/2] crypto: lrw - Fix an error handling path in 'create()'

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Le 09/10/2017 à 23:22, walter harms a écrit :
Am 08.10.2017 11:39, schrieb Christophe JAILLET:
All error handling paths 'goto err_drop_spawn' except this one.
In order to avoid some resources leak, we should do it as well here.

Fixes: 700cb3f5fe75 ("crypto: lrw - Convert to skcipher")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
  crypto/lrw.c | 6 ++++--
  1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/crypto/lrw.c b/crypto/lrw.c
index a8bfae4451bf..eb681e9fe574 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -610,8 +610,10 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
  		ecb_name[len - 1] = 0;
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
-			     "lrw(%s)", ecb_name) >= CRYPTO_MAX_ALG_NAME)
	this check can be done more easy,
	the length of ecb_name is len
	the length of inst->alg.base.cra_name is CRYPTO_MAX_ALG_NAME
	if CRYPTO_MAX_ALG_NAME-len < "lrw()" < 5
		no need to involve snprintf()

	just my 2 cents
	re,
  		wh
It does not only check for the length, it also copies some data.
The test should be read: "If the copy succeeds (i.e if there is enough space for the copy to succeed)", and not "if the string is too long".
IMHO, the snprintf is just fine here.

CJ
-			return -ENAMETOOLONG;
+			     "lrw(%s)", ecb_name) >= CRYPTO_MAX_ALG_NAME) {
+			err = -ENAMETOOLONG;
+			goto err_drop_spawn;
+		}
  	}
inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;


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