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crypto: af_alg - fix NULL pointer dereference in
Eric Biggers authored
 af_alg_free_areq_sgls()

If allocating the ->tsgl member of 'struct af_alg_async_req' failed,
during cleanup we dereferenced the NULL ->tsgl pointer in
af_alg_free_areq_sgls(), because ->tsgl_entries was nonzero.

Fix it by only freeing the ->tsgl list if it is non-NULL.

This affected both algif_skcipher and algif_aead.

Fixes: e870456d ("crypto: algif_skcipher - overhaul memory management")
Fixes: d887c52d

 ("crypto: algif_aead - overhaul memory management")
Reported-by: default avatarsyzbot <syzkaller@googlegroups.com>
Cc: <stable@vger.kernel.org> # v4.14+
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Reviewed-by: default avatarStephan Mueller <smueller@chronox.de>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
887207ed
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