From: Andrew Morton Date: Fri, 23 Jun 2006 09:05:31 +0000 (-0700) Subject: [PATCH] jbd: avoid kfree(NULL) X-Git-Tag: v2.6.18-rc1~1081^2~55 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=304c4c841a31c780a45d65e389b07706babf5d36;p=linux-2.6-omap-h63xx.git [PATCH] jbd: avoid kfree(NULL) There are a couple of places where JBD has to check to see whether an unneeded memory allocation was performed. Usually it _was_ needed, so we end up calling kfree(NULL). We can micro-optimise that by checking the pointer before calling kfree(). Thanks to Steven Rostedt for identifying this. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c index ff75afe9b18..508b2ea91f4 100644 --- a/fs/jbd/transaction.c +++ b/fs/jbd/transaction.c @@ -227,7 +227,8 @@ repeat_locked: spin_unlock(&transaction->t_handle_lock); spin_unlock(&journal->j_state_lock); out: - kfree(new_transaction); + if (unlikely(new_transaction)) /* It's usually NULL */ + kfree(new_transaction); return ret; } @@ -724,7 +725,8 @@ done: journal_cancel_revoke(handle, jh); out: - kfree(frozen_buffer); + if (unlikely(frozen_buffer)) /* It's usually NULL */ + kfree(frozen_buffer); JBUFFER_TRACE(jh, "exit"); return error; @@ -903,7 +905,8 @@ repeat: jbd_unlock_bh_state(bh); out: journal_put_journal_head(jh); - kfree(committed_data); + if (unlikely(committed_data)) + kfree(committed_data); return err; }