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fs/ntfs3: Correct function is_rst_area_valid

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Reported-by: Robert Morris <rtm@csail.mit.edu>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2024-01-26 11:13:59 +03:00
parent 4fd6c08a16
commit 1b7dd28e14
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GPG Key ID: A9B0331F832407B6
1 changed files with 8 additions and 6 deletions
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14
fs/ntfs3/fslog.c
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@ -465,7 +465,7 @@ static inline bool is_rst_area_valid(const struct RESTART_HDR *rhdr)
{
const struct RESTART_AREA *ra;
u16 cl, fl, ul;
u32 off, l_size, file_dat_bits, file_size_round;
u32 off, l_size, seq_bits;
u16 ro = le16_to_cpu(rhdr->ra_off);
u32 sys_page = le32_to_cpu(rhdr->sys_page_size);
@ -511,13 +511,15 @@ static inline bool is_rst_area_valid(const struct RESTART_HDR *rhdr)
/* Make sure the sequence number bits match the log file size. */
l_size = le64_to_cpu(ra->l_size);
file_dat_bits = sizeof(u64) * 8 - le32_to_cpu(ra->seq_num_bits);
file_size_round = 1u << (file_dat_bits + 3);
if (file_size_round != l_size &&
(file_size_round < l_size || (file_size_round / 2) > l_size)) {
return false;
seq_bits = sizeof(u64) * 8 + 3;
while (l_size) {
l_size >>= 1;
seq_bits -= 1;
}
if (seq_bits != ra->seq_num_bits)
return false;
/* The log page data offset and record header length must be quad-aligned. */
if (!IS_ALIGNED(le16_to_cpu(ra->data_off), 8) ||
!IS_ALIGNED(le16_to_cpu(ra->rec_hdr_len), 8))