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ntfs: do not dereference a null ctx on error

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In ntfs_mft_data_extend_allocation_nolock(), if an error condition occurs
prior to 'ctx' being set to a non-NULL value, avoid dereferencing the NULL
'ctx' pointer in error handling.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Danila Chernetsov <listdansp@mail.ru>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Danila Chernetsov 2023-05-19 00:21:46 +09:00 • committed by Christian Brauner
parent 6405fee9b0
commit aa4b92c523
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GPG key ID: 91C61BC06578DCA2
1 changed files with 19 additions and 17 deletions
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6
fs/ntfs/mft.c
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@ -1955,12 +1955,14 @@ undo_alloc:
"attribute.%s", es); "attribute.%s", es);
NVolSetErrors(vol); NVolSetErrors(vol);
} }
a = ctx->attr;
if (ntfs_rl_truncate_nolock(vol, &mft_ni->runlist, old_last_vcn)) { if (ntfs_rl_truncate_nolock(vol, &mft_ni->runlist, old_last_vcn)) {
ntfs_error(vol->sb, "Failed to truncate mft data attribute " ntfs_error(vol->sb, "Failed to truncate mft data attribute "
"runlist.%s", es); "runlist.%s", es);
NVolSetErrors(vol); NVolSetErrors(vol);
} }
if (ctx) {
a = ctx->attr;
if (mp_rebuilt && !IS_ERR(ctx->mrec)) { if (mp_rebuilt && !IS_ERR(ctx->mrec)) {
if (ntfs_mapping_pairs_build(vol, (u8 *)a + le16_to_cpu( if (ntfs_mapping_pairs_build(vol, (u8 *)a + le16_to_cpu(
a->data.non_resident.mapping_pairs_offset), a->data.non_resident.mapping_pairs_offset),
@ -1983,8 +1985,8 @@ undo_alloc:
"context.%s", es); "context.%s", es);
NVolSetErrors(vol); NVolSetErrors(vol);
} }
if (ctx)
ntfs_attr_put_search_ctx(ctx); ntfs_attr_put_search_ctx(ctx);
}
if (!IS_ERR(mrec)) if (!IS_ERR(mrec))
unmap_mft_record(mft_ni); unmap_mft_record(mft_ni);
up_write(&mft_ni->runlist.lock); up_write(&mft_ni->runlist.lock);