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ubi: eba: properly rollback inside self_check_eba

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commit 745d9f4a31 upstream.

In case of a memory allocation failure in the volumes loop we can only
process the already allocated scan_eba and fm_eba array elements on the
error path - others are still uninitialized.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 00abf30415 ("UBI: Add self_check_eba()")
Cc: stable@vger.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fedor Pchelkin 2024-02-29 23:42:36 +03:00 committed by Greg Kroah-Hartman
parent 17c312eb11
commit 3aba1db19b
1 changed files with 2 additions and 1 deletions
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3
drivers/mtd/ubi/eba.c
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@ -1560,6 +1560,7 @@ int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
GFP_KERNEL);
if (!fm_eba[i]) {
ret = -ENOMEM;
kfree(scan_eba[i]);
goto out_free;
}
@ -1595,7 +1596,7 @@ int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
}
out_free:
for (i = 0; i < num_volumes; i++) {
while (--i >= 0) {
if (!ubi->volumes[i])
continue;