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9p: do not trust pdu content for stat item size

Browse source 
v9fs_dir_readdir() could deadloop if a struct was sent with a size set
to -2

Link: http://lkml.kernel.org/r/[email protected]
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=88021
Signed-off-by: Gertjan Halkes <[email protected]>
Signed-off-by: Dominique Martinet <[email protected]>
This commit is contained in:
Gertjan Halkes 2018-09-05 15:41:29 +09:00 • committed by Dominique Martinet
commit 2803cf4379
2 changed files with 5 additions and 6 deletions
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8
fs/9p/vfs_dir.c
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@ -105,7 +105,6 @@ static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
int err = 0;
struct p9_fid *fid;
int buflen;
int reclen = 0;
struct p9_rdir *rdir;
struct kvec kvec;
@ -138,11 +137,10 @@ static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
while (rdir->head < rdir->tail) {
err = p9stat_read(fid->clnt, rdir->buf + rdir->head,
rdir->tail - rdir->head, &st);
if (err) {
if (err <= 0) {
p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
return -EIO;
}
reclen = st.size+2;
over = !dir_emit(ctx, st.name, strlen(st.name),
v9fs_qid2ino(&st.qid), dt_type(&st));
@ -150,8 +148,8 @@ static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
if (over)
return 0;
rdir->head += reclen;
ctx->pos += reclen;
rdir->head += err;
ctx->pos += err;
}
}
}