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authorAndrew Morton <akpm@osdl.org>2005-08-09 15:29:19 -0700
committerDavid S. Miller <davem@davemloft.net>2005-08-09 15:29:19 -0700
commitd64d3873721cfe870d49d73c3744f06260779ce7 (patch)
treeb49a930e65ed4f30b4f8f2aac4ddb08c41bc4b79 /Documentation/sysctl
parent3501466941347f0e1992b2672affb3feb92925fd (diff)
[NET]: Fix memory leak in sys_{send,recv}msg() w/compat
From: Dave Johnson <djohnson+linux-kernel@sw.starentnetworks.com> sendmsg()/recvmsg() syscalls from o32/n32 apps to a 64bit kernel will cause a kernel memory leak if iov_len > UIO_FASTIOV for each syscall! This is because both sys_sendmsg() and verify_compat_iovec() kmalloc a new iovec structure. Only the one from sys_sendmsg() is free'ed. I wrote a simple test program to confirm this after identifying the problem: http://davej.org/programs/testsendmsg.c Note that the below fix will break solaris_sendmsg()/solaris_recvmsg() as it also calls verify_compat_iovec() but expects it to malloc internally. [ I fixed that. -DaveM ] Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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