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libceph, ceph: avoid memory leak when specifying same option several times

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When parsing string option, in order to avoid memory leak we need to
carefully free it first in case of specifying same option several times.

Signed-off-by: Chengguang Xu <[email protected]>
Reviewed-by: Ilya Dryomov <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
This commit is contained in:
Chengguang Xu 2018-02-06 08:25:55 +08:00 • committed by Ilya Dryomov
commit 937441f3a3
2 changed files with 9 additions and 0 deletions
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2
fs/ceph/super.c
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@ -225,6 +225,7 @@ static int parse_fsopt_token(char *c, void *private)
return -ENOMEM;
break;
case Opt_mds_namespace:
kfree(fsopt->mds_namespace);
fsopt->mds_namespace = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);
@ -232,6 +233,7 @@ static int parse_fsopt_token(char *c, void *private)
return -ENOMEM;
break;
case Opt_fscache_uniq:
kfree(fsopt->fscache_uniq);
fsopt->fscache_uniq = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);