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From 68ef8adcff3acc25ddac82b808c3036b4dddaf0b Mon Sep 17 00:00:00 2001
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From: Lukas Czerner <lczerner@redhat.com>
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Date: Thu, 20 Feb 2014 14:14:39 +0100
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Subject: [PATCH 8/8] e2fsprogs: Set pointer to NULL after ext2fs_free
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ext2fs_free() does not set the ext2_filsys pointer to null so the caller
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is responsible to setting it himself if it is needed.
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This patch fixes some places where caller did not set ext2_filsys
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pointer to NULL after ext2fs_free() which might result in use after
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free. Fix it.
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Signed-off-by: Lukas Czerner <lczerner@redhat.com>
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---
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lib/ext2fs/openfs.c | 7 ++++---
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resize/resize2fs.c | 5 ++++-
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2 files changed, 8 insertions(+), 4 deletions(-)
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diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
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index 4cdbde1..ef67493 100644
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--- a/lib/ext2fs/openfs.c
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+++ b/lib/ext2fs/openfs.c
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@@ -419,10 +419,11 @@ errcode_t ext2fs_open2(const char *name, const char *io_options,
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return 0;
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cleanup:
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- if (flags & EXT2_FLAG_NOFREE_ON_ERROR)
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- *ret_fs = fs;
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- else
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+ if (!(flags & EXT2_FLAG_NOFREE_ON_ERROR)) {
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ext2fs_free(fs);
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+ fs = NULL;
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+ }
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+ *ret_fs = fs;
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return retval;
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}
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diff --git a/resize/resize2fs.c b/resize/resize2fs.c
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index 6b32bbf..a1fdefa 100644
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--- a/resize/resize2fs.c
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+++ b/resize/resize2fs.c
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@@ -202,6 +202,7 @@ errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
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rfs->flags = flags;
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ext2fs_free(rfs->old_fs);
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+ rfs->old_fs = NULL;
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if (rfs->itable_buf)
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ext2fs_free_mem(&rfs->itable_buf);
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if (rfs->reserve_blocks)
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@@ -213,8 +214,10 @@ errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
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return 0;
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errout:
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- if (rfs->new_fs)
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+ if (rfs->new_fs) {
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ext2fs_free(rfs->new_fs);
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+ rfs->new_fs = NULL;
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+ }
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if (rfs->itable_buf)
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ext2fs_free_mem(&rfs->itable_buf);
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ext2fs_free_mem(&rfs;;
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--
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1.8.3.1
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