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fs/ntfs3: Fix wrong if in hdr_first_de

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We need to check used bytes instead of total.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2022-10-11 20:15:28 +03:00
parent 97a6815e50
commit 60ce8dfde0
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GPG Key ID: A9B0331F832407B6
1 changed files with 3 additions and 2 deletions
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5
fs/ntfs3/ntfs.h
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@ -714,12 +714,13 @@ static inline struct NTFS_DE *hdr_first_de(const struct INDEX_HDR *hdr)
{
u32 de_off = le32_to_cpu(hdr->de_off);
u32 used = le32_to_cpu(hdr->used);
struct NTFS_DE *e = Add2Ptr(hdr, de_off);
struct NTFS_DE *e;
u16 esize;
if (de_off >= used || de_off >= le32_to_cpu(hdr->total))
if (de_off >= used || de_off + sizeof(struct NTFS_DE) > used )
return NULL;
e = Add2Ptr(hdr, de_off);
esize = le16_to_cpu(e->size);
if (esize < sizeof(struct NTFS_DE) || de_off + esize > used)
return NULL;