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Fix a bug in the FAT unbind() logic. There were problems with the way certain internal list handling was implemented. The end result is that newly opened or cloned file structures were never being added to the list of open files. So when the unmount() happens, it always looked like there were not open files and a crash could ensue.

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This commit is contained in:
Gregory Nutt 2015-03-14 17:33:48 -06:00
parent 8055ba4d03
commit 2be14d09a2
1 changed files with 24 additions and 2 deletions
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26
fs/fat/fs_fat32.c
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@ -353,7 +353,7 @@ static int fat_open(FAR struct file *filep, const char *relpath,
*/
ff->ff_next = fs->fs_head;
fs->fs_head = ff->ff_next;
fs->fs_head = ff;
fat_semgive(fs);
@ -391,6 +391,8 @@ static int fat_close(FAR struct file *filep)
{
struct inode *inode;
struct fat_file_s *ff;
struct fat_file_s *currff;
struct fat_file_s *prevff;
struct fat_mountpt_s *fs;
int ret;
@ -412,6 +414,26 @@ static int fat_close(FAR struct file *filep)
ret = fat_sync(filep);
/* Remove the file structure from the list of open files in the mountpoint
* structure.
*/
for (prevff = NULL, currff = fs->fs_head;
currff && currff != ff;
prevff = currff, currff = currff->ff_next);
if (currff)
{
if (prevff)
{
prevff->ff_next = ff->ff_next;
}
else
{
fs->fs_head = ff->ff_next;
}
}
/* Then deallocate the memory structures created when the open method
* was called.
*
@ -1408,7 +1430,7 @@ static int fat_dup(FAR const struct file *oldp, FAR struct file *newp)
*/
newff->ff_next = fs->fs_head;
fs->fs_head = newff->ff_next;
fs->fs_head = newff;
fat_semgive(fs);
return OK;