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pstore/zone: Add a null pointer check to the psz_kmsg_read
[ Upstream commit 98bc7e26e1
]
kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful
by checking the pointer validity.
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Link: https://lore.kernel.org/r/20240118100206.213928-1-chentao@kylinos.cn
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 2 additions and 0 deletions
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@ -973,6 +973,8 @@ static ssize_t psz_kmsg_read(struct pstore_zone *zone,
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char *buf = kasprintf(GFP_KERNEL, "%s: Total %d times\n",
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kmsg_dump_reason_str(record->reason),
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record->count);
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if (!buf)
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return -ENOMEM;
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hlen = strlen(buf);
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record->buf = krealloc(buf, hlen + size, GFP_KERNEL);
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if (!record->buf) {
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