In the Linux kernel, the following vulnerability has been resolved:

drm/vc4: fix krealloc() memory leak

Don't just overwrite the original pointer passed to krealloc()
with its return value without checking latter:

    MEM = krealloc(MEM, SZ, GFP);

If krealloc() returns NULL, that erases the pointer
to the still allocated memory, hence leaks this memory.
Instead, use a temporary variable, check it's not NULL
and only then assign it to the original pointer:

    TMP = krealloc(MEM, SZ, GFP);
    if (!TMP) return;
    MEM = TMP;

While on it, use krealloc_array().

https://git.kernel.org/stable/c/02f5e4db57c0cdd7bac89d503b301a093a0fa95c

https://git.kernel.org/stable/c/30165a09f76eaf34951c818eb5d9d6e4771d76f6

https://git.kernel.org/stable/c/4fc692dc6df5bc777cc1bcebf95179e28594875f

https://git.kernel.org/stable/c/5d563a5da8717629ae72f9eadf1e0e340bd1658b

https://git.kernel.org/stable/c/c034aa0b1ba5f49cbdf8ef193d6ec714d74aac27

https://git.kernel.org/stable/c/e0ce103e89d61eef70edc1d1ae3bfd4c0aacbc2e

https://git.kernel.org/stable/c/fd87d6966041e33ef7d2e5dc59f9a52b71c6ae5f

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