linux-kernel - Re: [PATCH] ext4: validate extent entries before caching in ext4_find

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Message-ID: <20250929154548.360371-1-kartikey406@gmail.com>
Date: Mon, 29 Sep 2025 21:15:48 +0530
From: Deepanshu Kartikey <kartikey406@...il.com>
To: tytso@....edu,
	adilger.kernel@...ger.ca,
	yi.zhang@...weicloud.com
Cc: linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: validate extent entries before caching in ext4_find_extent()

Zhang Yi,

I've prepared v2 based on your feedback about avoiding redundant checks. 
After further analysis, I'm detecting the invalid INLINE_DATA + EXTENTS 
flag combination rather than just VERITY + INLINE_DATA, as this addresses 
the broader issue of mutually exclusive flags.

The v2 patch rejects any inode with both INLINE_DATA and EXTENTS flags set,
which catches this corruption and potentially other similar cases.

Thank you for guiding me to the root cause.

Best regards,
Deepanshu