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NFSD: Cap the number of bytes copied by nfs4_reset_recoverydir()

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[ Upstream commit f64ea4af43161bb86ffc77e6aeb5bcf5c3229df0 ]

It's only current caller already length-checks the string, but let's
be safe.

Fixes: 0964a3d3f1aa ("[PATCH] knfsd: nfsd4 reboot dirname fix")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chuck Lever 2024-10-17 11:03:56 -04:00 committed by Ksawlii
parent 8589fc2e30
commit 672c09ab1f
1 changed files with 2 additions and 1 deletions
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3
fs/nfsd/nfs4recover.c
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@ -658,7 +658,8 @@ nfs4_reset_recoverydir(char *recdir)
return status; return status;
status = -ENOTDIR; status = -ENOTDIR;
if (d_is_dir(path.dentry)) { if (d_is_dir(path.dentry)) {
strcpy(user_recovery_dirname, recdir); strscpy(user_recovery_dirname, recdir,
sizeof(user_recovery_dirname));
status = 0; status = 0;
} }
path_put(&path); path_put(&path);