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Pull request for inclusion in 4.21

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Missing prototype warning fix and a syzkaller fix when a 9p server
 advertises a too small msize
 
 ----------------------------------------------------------------
 Adeodato Simó (1):
       net/9p: include trans_common.h to fix missing prototype warning.
 
 Dominique Martinet (1):
       9p/net: put a lower bound on msize
 
  net/9p/client.c       | 21 +++++++++++++++++++++
  net/9p/trans_common.c |  1 +
  2 files changed, 22 insertions(+)
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Merge tag '9p-for-4.21' of git://github.com/martinetd/linux

Pull 9p updates from Dominique Martinet:
 "Missing prototype warning fix and a syzkaller fix when a 9p server
  advertises a too small msize"

* tag '9p-for-4.21' of git://github.com/martinetd/linux:
  9p/net: put a lower bound on msize
  net/9p: include trans_common.h to fix missing prototype warning.
This commit is contained in:
Linus Torvalds 2019-01-02 12:11:01 -08:00
commit 85f78456f2
2 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
net/9p/client.c
View File

@ -181,6 +181,12 @@ static int parse_opts(char *opts, struct p9_client *clnt)
ret = r;
continue;
}
if (option < 4096) {
p9_debug(P9_DEBUG_ERROR,
"msize should be at least 4k\n");
ret = -EINVAL;
continue;
}
clnt->msize = option;
break;
case Opt_trans:
@ -983,10 +989,18 @@ static int p9_client_version(struct p9_client *c)
else if (!strncmp(version, "9P2000", 6))
c->proto_version = p9_proto_legacy;
else {
p9_debug(P9_DEBUG_ERROR,
"server returned an unknown version: %s\n", version);
err = -EREMOTEIO;
goto error;
}
if (msize < 4096) {
p9_debug(P9_DEBUG_ERROR,
"server returned a msize < 4096: %d\n", msize);
err = -EREMOTEIO;
goto error;
}
if (msize < c->msize)
c->msize = msize;
@ -1043,6 +1057,13 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
if (clnt->msize > clnt->trans_mod->maxsize)
clnt->msize = clnt->trans_mod->maxsize;
if (clnt->msize < 4096) {
p9_debug(P9_DEBUG_ERROR,
"Please specify a msize of at least 4k\n");
err = -EINVAL;
goto free_client;
}
err = p9_client_version(clnt);
if (err)
goto close_trans;

1
net/9p/trans_common.c
View File

@ -14,6 +14,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include "trans_common.h"
/**
* p9_release_pages - Release pages after the transaction.