[LU-13891] ladvise: buffer allocated for ioctl is never released

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Affects Version/s: Lustre 2.14.0, Lustre 2.12.6
• Labels: patch
• Assignee: Jean-Yves Vet (Inactive)
• Reporter: Jean-Yves Vet (Inactive)

Description

There is a memory leak in the llapi_ladvise function. ladvise_hdr is never freed. 

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/39610/
Subject: LU-13891 utils: fix memory leak in llapi_ladvise()
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 50ce29a3b59a8c2984a928ea062e0b415739724d

[Gerrit Updater]

Jean-Yves Vet ([e-mail]) uploaded a new patch: https://review.whamcloud.com/39610
Subject: LU-13891 ladvise: Fix a memory leak
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 1cac9d5772fdaf5d9c10e30dfbe40ec14ac7e321

[Jean-Yves Vet (Inactive)]

Hi Andreas, thanks for the review! Peter Jones kindly helped. I can now log in to gerrit. I've modified the patch and will push for review the new version as soon as I get push permissions set. 

[Andreas Dilger]

Hi Jean-Yves, thanks for the patch. I'm just asking about an account for you.

 	rc = ioctl(fd, LL_IOC_LADVISE, ladvise_hdr);
 	if (rc < 0) {
+		free(ladvise_hdr);
 		llapi_error(LLAPI_MSG_ERROR, -errno, "cannot give advice");
 		return -1;
 	}
@@ -92,6 +93,7 @@ int llapi_ladvise(int fd, unsigned long long flags, int num_advise,
 					ladvise_iter->lla_lockahead_result;
 	}
 
+	free(ladvise_hdr);
 	return 0;
 }

It is preferred to have the error case use a goto and have only a single free() call at the end. Usig a single cleanup path avoids duplicate logic at each error site, and avoids similar leaks in the future.

[Jean-Yves Vet (Inactive)]

Sorry, I don't have any account on review.whamcloud.com (same with id.whamcloud.com). I'll attach the patch to this ticket. 

[Jean-Yves Vet (Inactive)]

I'll submit a very small fix shortly.