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crypto: qat - fix double free in qat_uclo_create_batch_init_list

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clang static analysis flags this error

qat_uclo.c:297:3: warning: Attempt to free released memory
  [unix.Malloc]
                kfree(*init_tab_base);
                ^~~~~~~~~~~~~~~~~~~~~

When input *init_tab_base is null, the function allocates memory for
the head of the list.  When there is problem allocating other list
elements the list is unwound and freed.  Then a check is made if the
list head was allocated and is also freed.

Keeping track of the what may need to be freed is the variable 'tail_old'.
The unwinding/freeing block is

	while (tail_old) {
		mem_init = tail_old->next;
		kfree(tail_old);
		tail_old = mem_init;
	}

The problem is that the first element of tail_old is also what was
allocated for the list head

		init_header = kzalloc(sizeof(*init_header), GFP_KERNEL);
		...
		*init_tab_base = init_header;
		flag = 1;
	}
	tail_old = init_header;

So *init_tab_base/init_header are freed twice.

There is another problem.
When the input *init_tab_base is non null the tail_old is calculated by
traveling down the list to first non null entry.

	tail_old = init_header;
	while (tail_old->next)
		tail_old = tail_old->next;

When the unwinding free happens, the last entry of the input list will
be freed.

So the freeing needs a general changed.
If locally allocated the first element of tail_old is freed, else it
is skipped.  As a bit of cleanup, reset *init_tab_base if it came in
as null.

Fixes: b4b7e67c91 ("crypto: qat - Intel(R) QAT ucode part of fw loader")
Cc: <stable@vger.kernel.org>
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tom Rix 2020-07-13 07:06:34 -07:00 committed by Herbert Xu
parent fd92028e4c
commit c06c76602e
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/crypto/qat/qat_common/qat_uclo.c
View File

@ -288,13 +288,18 @@ static int qat_uclo_create_batch_init_list(struct icp_qat_fw_loader_handle
}
return 0;
out_err:
/* Do not free the list head unless we allocated it. */
tail_old = tail_old->next;
if (flag) {
kfree(*init_tab_base);
*init_tab_base = NULL;
}
while (tail_old) {
mem_init = tail_old->next;
kfree(tail_old);
tail_old = mem_init;
}
if (flag)
kfree(*init_tab_base);
return -ENOMEM;
}