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tmpfs: old data was loaded when SEEK_SET beyond end of the file

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Signed-off-by: guohao15 <guohao15@xiaomi.com>
This commit is contained in:
guohao15
2024-02-28 17:17:46 +08:00
committed by Xiang Xiao
parent 7f16770b91
commit 43bcac952a
1 changed files with 15 additions and 1 deletions
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fs/tmpfs/fs_tmpfs.c
+15 -1
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@@ -281,13 +281,27 @@ static int tmpfs_realloc_file(FAR struct tmpfs_file_s *tfo,
* zero. * zero.
*/ */
if (newsize > 0) if (newsize == 0)
{
/* Free the file object */
kmm_free(tfo->tfo_data);
tfo->tfo_data = NULL;
tfo->tfo_alloc = 0;
tfo->tfo_size = 0;
return OK;
}
else if (newsize > 0)
{ {
/* Otherwise, don't realloc unless the object has shrunk by a /* Otherwise, don't realloc unless the object has shrunk by a
* lot. * lot.
*/ */
delta = tfo->tfo_alloc - newsize; delta = tfo->tfo_alloc - newsize;
/* We should make sure the shrunked memory be zero */
memset(tfo->tfo_data + newsize, 0, delta);
if (delta <= CONFIG_FS_TMPFS_FILE_FREEGUARD) if (delta <= CONFIG_FS_TMPFS_FILE_FREEGUARD)
{ {
/* Hasn't shrunk enough.. Return doing nothing for now */ /* Hasn't shrunk enough.. Return doing nothing for now */