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Fixed potential file system corruption when truncating or overwriting file data with fault tolerant mode enabled (#78)

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* _fx_fault_tolerant_cleanup_FAT_chain(): Add checks to prevent starting a new cluster deletion session in some corner cases where the end of the chain is reached.

* Fixed formatting of previous commit.
This commit is contained in:
Jonathan Blanchard
2026-02-10 09:31:41 -05:00
committed by GitHub
parent 0462b027a1
commit dfe5084ab8
1 changed files with 11 additions and 3 deletions
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common/src/fx_fault_tolerant_cleanup_FAT_chain.c
+9 -1
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@@ -207,7 +207,7 @@ ULONG last_FAT_sector;
/* At this point, the head_cluster points to the cluster chain that is to be removed. */ /* At this point, the head_cluster points to the cluster chain that is to be removed. */
/* Tail cluster points to the back of the origianal FAT chain where the new chain is attached to. /* Tail cluster points to the back of the original FAT chain where the new chain is attached to.
The remove process terminates once this cluster is encountered. */ The remove process terminates once this cluster is encountered. */
tail_cluster = _fx_utility_32_unsigned_read((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_insertion_back); tail_cluster = _fx_utility_32_unsigned_read((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_insertion_back);
@@ -261,9 +261,13 @@ ULONG last_FAT_sector;
if (_fx_utility_FAT_entry_multiple_sectors_check(media_ptr, current_cluster)) if (_fx_utility_FAT_entry_multiple_sectors_check(media_ptr, current_cluster))
{ {
if (head_cluster == next_session || next_session == FX_FREE_CLUSTER) if (head_cluster == next_session || next_session == FX_FREE_CLUSTER)
{
/* Do not start another session if this is the end of the chain. */
if (next_cluster != tail_cluster)
{ {
next_session = next_cluster; next_session = next_cluster;
} }
}
break; break;
} }
@@ -276,9 +280,13 @@ ULONG last_FAT_sector;
/* Get next session. */ /* Get next session. */
if (cache_count == cache_max) if (cache_count == cache_max)
{
/* Do not start another session if this is the end of the chain. */
if (next_cluster != tail_cluster)
{ {
next_session = next_cluster; next_session = next_cluster;
} }
}
/* Update head cluster and next session into log file. */ /* Update head cluster and next session into log file. */
_fx_utility_32_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_next_deletion, next_session); _fx_utility_32_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_next_deletion, next_session);