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[0.4.9] cherry-pick [FASTFAT] Properly check for buffer size on dir enumeration.

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This avoids improper returns when multiple entries are requested
and, in rare circumstances, entries not being seen by umode.

CORE-14699

(cherry picked from commit 01e2877161)
This commit is contained in:
Pierre Schweitzer 2018-06-07 19:33:23 +02:00 committed by Joachim Henze
parent fb0fd2b462
commit ea76ef8477
1 changed files with 4 additions and 4 deletions
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8
drivers/filesystems/fastfat/dir.c
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@ -104,7 +104,7 @@ VfatGetFileNamesInformation(
if (FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength >= FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName) + DirContext->LongNameU.Length))
if (First || (BufferLength > FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
@ -149,7 +149,7 @@ VfatGetFileDirectoryInformation(
if (FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength >= FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName) + DirContext->LongNameU.Length))
if (First || (BufferLength > FIELD_OFFSET(FILE_DIRECTORY_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
/* pInfo->FileIndex = ; */
@ -266,7 +266,7 @@ VfatGetFileFullDirectoryInformation(
if (FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength >= FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName) + DirContext->LongNameU.Length))
if (First || (BufferLength > FIELD_OFFSET(FILE_FULL_DIR_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
/* pInfo->FileIndex = ; */
@ -362,7 +362,7 @@ VfatGetFileBothInformation(
if (FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName) > BufferLength)
return Status;
if (First || (BufferLength >= FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName) + DirContext->LongNameU.Length))
if (First || (BufferLength > FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName) + DirContext->LongNameU.Length))
{
pInfo->FileNameLength = DirContext->LongNameU.Length;
pInfo->EaSize = 0;