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fs: prevent out-of-bounds array speculation when closing a file descriptor

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Google-Bug-Id: 114199369
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Theodore Ts'o
2023-03-06 13:54:50 -05:00
committed by Al Viro
parent c64c67c074
commit 609d544414
1 changed files with 1 additions and 0 deletions
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fs/file.c
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@@ -642,6 +642,7 @@ static struct file *pick_file(struct files_struct *files, unsigned fd)
if (fd >= fdt->max_fds) if (fd >= fdt->max_fds)
return NULL; return NULL;
fd = array_index_nospec(fd, fdt->max_fds);
file = fdt->fd[fd]; file = fdt->fd[fd];
if (file) { if (file) {
rcu_assign_pointer(fdt->fd[fd], NULL); rcu_assign_pointer(fdt->fd[fd], NULL);