Commit 953f918d authored by Linus Torvalds's avatar Linus Torvalds Committed by Greg Kroah-Hartman

squashfs: more metadata hardening

commit d5125847 upstream.

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: default avatarAnatoly Trosinenko <>
Acked-by: default avatarPhillip Lougher <>
Signed-off-by: default avatarLinus Torvalds <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent a766ccbf
......@@ -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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