From: Guy Streeter <streeter@redhat.com>
Date: Tue, 8 May 2007 07:25:12 +0000 (-0700)
Subject: Cap shmmax at INT_MAX in compat shminfo
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=af7c693f146069a1f44739acef9abf1bc27f7247;p=openwrt%2Fstaging%2Fblogic.git

Cap shmmax at INT_MAX in compat shminfo

The value of shmmax may be larger than will fit in the struct used by
the 32bit compat version of sys_shmctl. This change mirrors what the
normal sys_shmctl does when called with the old IPC_INFO command.

Signed-off-by: Guy Streeter <streeter@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/ipc/compat.c b/ipc/compat.c
index fa18141539fb..8b44aa9a7c95 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -542,6 +542,8 @@ static inline int put_compat_shminfo64(struct shminfo64 *smi,
 
 	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 		return -EFAULT;
+	if (smi->shmmax > INT_MAX)
+		smi->shmmax = INT_MAX;
 	err  = __put_user(smi->shmmax, &up64->shmmax);
 	err |= __put_user(smi->shmmin, &up64->shmmin);
 	err |= __put_user(smi->shmmni, &up64->shmmni);
@@ -557,6 +559,8 @@ static inline int put_compat_shminfo(struct shminfo64 *smi,
 
 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 		return -EFAULT;
+	if (smi->shmmax > INT_MAX)
+		smi->shmmax = INT_MAX;
 	err  = __put_user(smi->shmmax, &up->shmmax);
 	err |= __put_user(smi->shmmin, &up->shmmin);
 	err |= __put_user(smi->shmmni, &up->shmmni);