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Koen Kooi
bb34e69f3d
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
42 lines
1.3 KiB
Diff
42 lines
1.3 KiB
Diff
From 3a71b922c02de36168d14ec55a97582f3fec2e07 Mon Sep 17 00:00:00 2001
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From: Theodore Ts'o <tytso@mit.edu>
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Date: Sun, 11 Mar 2012 23:30:16 -0400
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Subject: [PATCH 111/147] ext4: check for zero length extent
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commit 31d4f3a2f3c73f279ff96a7135d7202ef6833f12 upstream.
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Explicitly test for an extent whose length is zero, and flag that as a
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corrupted extent.
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This avoids a kernel BUG_ON assertion failure.
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Tested: Without this patch, the file system image found in
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tests/f_ext_zero_len/image.gz in the latest e2fsprogs sources causes a
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kernel panic. With this patch, an ext4 file system error is noted
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instead, and the file system is marked as being corrupted.
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https://bugzilla.kernel.org/show_bug.cgi?id=42859
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Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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fs/ext4/extents.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
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index 607b155..7507036 100644
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--- a/fs/ext4/extents.c
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+++ b/fs/ext4/extents.c
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@@ -301,6 +301,8 @@ static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
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ext4_fsblk_t block = ext4_ext_pblock(ext);
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int len = ext4_ext_get_actual_len(ext);
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+ if (len == 0)
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+ return 0;
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return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
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}
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--
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1.7.9.4
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