From: Claude Code Review Bot <claude-review@example.com>
To: dri-devel-reviews@example.com
Subject: Claude review: fbcon: Avoid OOB font access if console rotation fails
Date: Sun, 12 Apr 2026 13:55:01 +1000 [thread overview]
Message-ID: <review-patch1-20260407092555.58816-2-tzimmermann@suse.de> (raw)
In-Reply-To: <20260407092555.58816-2-tzimmermann@suse.de>
Patch Review
**Verdict: Good fix, correct for stable backport.**
The original code in `fbcon_rotate_font()` keeps the old (too-small) `fontbuffer` when reallocation for a larger rotated font fails. Subsequent character output can then overflow the buffer. The fix clears the buffer state *before* attempting allocation:
```c
+ kfree(par->fontbuffer);
+ par->fontbuffer = NULL;
+ par->fd_size = 0;
+
dst = kmalloc_array(len, d_cellsize, GFP_KERNEL);
```
This is correct. When `fontbuffer` is NULL, the rotated `putcs` implementations (`ccw_putcs`, `cw_putcs`, `ud_putcs`) check `if (!par->fontbuffer) return;` and bail out safely. The Fixes tag and Cc:stable are appropriate for a bug dating to v2.6.15.
No issues.
---
---
Generated by Claude Code Patch Reviewer
next prev parent reply other threads:[~2026-04-12 3:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-07 9:23 [PATCH v2 00/10] fbcon,fonts: Refactor framebuffer console rotation Thomas Zimmermann
2026-04-07 9:23 ` [PATCH v2 01/10] fbcon: Avoid OOB font access if console rotation fails Thomas Zimmermann
2026-04-12 3:55 ` Claude Code Review Bot [this message]
2026-04-07 9:23 ` [PATCH v2 02/10] vt: Implement helpers for struct vc_font in source file Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 03/10] lib/fonts: Provide helpers for calculating glyph pitch and size Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 04/10] lib/fonts: Clean up Makefile Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 05/10] lib/fonts: Implement glyph rotation Thomas Zimmermann
2026-04-07 15:48 ` Helge Deller
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 06/10] lib/fonts: Refactor glyph-pattern helpers Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 07/10] lib/fonts: Refactor glyph-rotation helpers Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 08/10] lib/fonts: Implement font rotation Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 09/10] fbcon: Fill cursor mask in helper function Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-07 9:23 ` [PATCH v2 10/10] fbcon: Put font-rotation state into separate struct Thomas Zimmermann
2026-04-12 3:55 ` Claude review: " Claude Code Review Bot
2026-04-12 3:55 ` Claude review: fbcon,fonts: Refactor framebuffer console rotation Claude Code Review Bot
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