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nfs: Fix memory leak of export_path

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The try_location function is called within a loop by nfs_follow_referral.
try_location calls nfs4_pathname_string to created the export_path.
nfs4_pathname_string allocates the memory. export_path is stored in the
nfs_fs_context/fs_context structure similarly as hostname and source.
But whereas the ctx hostname and source are freed before assignment,
export_path is not.  So if there are multiple loops, the new export_path
will overwrite the old without the old being freed.

So call kfree for export_path.

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Tom Rix 2020-06-12 15:45:49 -07:00 committed by Anna Schumaker
parent b7ade38165
commit 4659ed7cc8
1 changed files with 1 additions and 0 deletions
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fs/nfs/nfs4namespace.c
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@ -308,6 +308,7 @@ static int try_location(struct fs_context *fc,
if (IS_ERR(export_path)) if (IS_ERR(export_path))
return PTR_ERR(export_path); return PTR_ERR(export_path);
kfree(ctx->nfs_server.export_path);
ctx->nfs_server.export_path = export_path; ctx->nfs_server.export_path = export_path;
source = kmalloc(len + 1 + ctx->nfs_server.export_path_len + 1, source = kmalloc(len + 1 + ctx->nfs_server.export_path_len + 1,