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kernel: properly handle paging errors in fit partition parser

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The uImage.FIT partition uses page mapping without properly handling
paging errors. This can lead to Kernel Oops in case of read errors
while trying to parse uImage.FIT partitions.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2021-08-27 21:30:32 +01:00
parent 97e32e9702
commit cf40141b51
No known key found for this signature in database
GPG key ID: 5A8F39C31C3217CA
1 changed files with 5 additions and 2 deletions
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7
target/linux/generic/files/block/partitions/fit.c
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@ -92,8 +92,11 @@ int parse_fit_partitions(struct parsed_partitions *state, u64 fit_start_sector,
return -ERANGE;
page = read_mapping_page(mapping, fit_start_sector >> (PAGE_SHIFT - SECTOR_SHIFT), NULL);
if (!page)
return -ENOMEM;
if (IS_ERR(page))
return -EFAULT;
if (PageError(page))
return -EFAULT;
init_fit = page_address(page);