Commit d5125847 authored by Linus Torvalds's avatar Linus Torvalds

squashfs: more metadata hardening

Anatoly reports another squashfs fuzzing issue, where the decompression
parameters themselves are in a compressed block.

This causes squashfs_read_data() to be called in order to read the
decompression options before the decompression stream having been set
up, making squashfs go sideways.
Reported-by: 's avatarAnatoly Trosinenko <>
Acked-by: 's avatarPhillip Lougher <>
Signed-off-by: 's avatarLinus Torvalds <>
parent 527838d4
......@@ -167,6 +167,8 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
if (compressed) {
if (!msblk->stream)
goto read_failure;
length = squashfs_decompress(msblk, bh, b, offset, length,
if (length < 0)
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