linux-kernel - Re: [PATCH] ALSA: sound/isa/gus: check the return value of kstrdup()

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Date:   Mon, 13 Dec 2021 16:06:47 +0800
From:   Xiaoke Wang <xkernel.wang@...mail.com>
To:     perex@...ex.cz, tiwai@...e.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: Re: [PATCH] ALSA: sound/isa/gus: check the return value of kstrdup()

Note: Compare with the last email, this one is using my full name.
kstrdup() returns NULL when some internal memory errors happen, it is
better to check the return value of it. Otherwise, we may not to be able
to catch some memory errors in time.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
 sound/isa/gus/gus_mem.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/isa/gus/gus_mem.c b/sound/isa/gus/gus_mem.c
index ff9480f..f8d915f 100644
--- a/sound/isa/gus/gus_mem.c
+++ b/sound/isa/gus/gus_mem.c
@@ -199,6 +199,8 @@ struct snd_gf1_mem_block *snd_gf1_mem_alloc(struct snd_gf1_mem * alloc, int owne
 		memcpy(&block.share_id, share_id, sizeof(block.share_id));
 	block.owner = owner;
 	block.name = kstrdup(name, GFP_KERNEL);
+	if (block.name == NULL)
+		return NULL;
 	nblock = snd_gf1_mem_xalloc(alloc, &block);
 	snd_gf1_mem_lock(alloc, 1);
 	return nblock;
@@ -237,13 +239,13 @@ int snd_gf1_mem_init(struct snd_gus_card * gus)
 		block.ptr = 0;
 		block.size = 1024;
 		block.name = kstrdup("InterWave LFOs", GFP_KERNEL);
-		if (snd_gf1_mem_xalloc(alloc, &block) == NULL)
+		if (block.name == NULL || snd_gf1_mem_xalloc(alloc, &block) == NULL)
 			return -ENOMEM;
 	}
 	block.ptr = gus->gf1.default_voice_address;
 	block.size = 4;
 	block.name = kstrdup("Voice default (NULL's)", GFP_KERNEL);
-	if (snd_gf1_mem_xalloc(alloc, &block) == NULL)
+	if (block.name == NULL || snd_gf1_mem_xalloc(alloc, &block) == NULL)
 		return -ENOMEM;
 #ifdef CONFIG_SND_DEBUG
 	snd_card_ro_proc_new(gus->card, "gusmem", gus, snd_gf1_mem_info_read);
--