ubifs: Fix out-of-bounds memory access caused by abnormal value of node_len

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In “ubifs_check_node”, when the value of "node_len" is abnormal,
the code will goto label of "out_len" for execution. Then, in the
following "ubifs_dump_node", if inode type is "UBIFS_DATA_NODE",
in "print_hex_dump", an out-of-bounds access may occur due to the
wrong "ch->len".

Therefore, when the value of "node_len" is abnormal, data length
should to be adjusted to a reasonable safe range. At this time,
structured data is not credible, so dump the corrupted data directly
for analysis.

Signed-off-by: Liu Song <liu.song11@zte.com.cn>
Signed-off-by: Richard Weinberger <richard@nod.at>

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Liu Song 2020-01-16 23:36:07 +08:00 • committed by Richard Weinberger

parent 294a8dbe34

commit acc5af3efa

1 changed files with 14 additions and 2 deletions

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fs/ubifs/io.c

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