e63bffb7b5
- Fix invalid free in mount.cifs; (bsc#1152930). * add 0012-mount.cifs-Fix-invalid-free.patch OBS-URL: https://build.opensuse.org/request/show/736712 OBS-URL: https://build.opensuse.org/package/show/network:samba:STABLE/cifs-utils?expand=0&rev=177
78 lines
2.4 KiB
Diff
78 lines
2.4 KiB
Diff
From d48a8d61c07e3841ffd71f3aafa5db28dd35b6a7 Mon Sep 17 00:00:00 2001
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From: "Paulo Alcantara (SUSE)" <pc@cjr.nz>
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Date: Thu, 19 Sep 2019 08:35:47 -0300
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Subject: [PATCH] mount.cifs: Fix invalid free
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When attemping to chdir into non-existing directories, mount.cifs
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crashes.
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This patch fixes the following ASAN report:
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$ ./mount.cifs //localhost/foo /mnt/invalid-dir -o ...
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/mnt/bar -o username=foo,password=foo,vers=1.0
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Couldn't chdir to /mnt/bar: No such file or directory
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=================================================================
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==11846==ERROR: AddressSanitizer: attempting free on address which was
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not malloc()-ed: 0x7ffd86332e97 in thread T0
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#0 0x7f0860ca01e7 in
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__interceptor_free (/usr/lib64/libasan.so.5+0x10a1e7)
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#1 0x557edece9ccb in
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acquire_mountpoint (/home/paulo/src/cifs-utils/mount.cifs+0xeccb)
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#2 0x557edecea63d in
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main (/home/paulo/src/cifs-utils/mount.cifs+0xf63d)
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#3 0x7f08609f0bca in __libc_start_main (/lib64/libc.so.6+0x26bca)
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#4 0x557edece27d9 in
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_start (/home/paulo/src/cifs-utils/mount.cifs+0x77d9)
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Address 0x7ffd86332e97 is located in stack of thread T0 at offset 8951
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in frame
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#0 0x557edece9ce0 in
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main (/home/paulo/src/cifs-utils/mount.cifs+0xece0)
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This frame has 2 object(s):
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[48, 52) 'rc' (line 1959)
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[64, 72) 'mountpoint' (line 1955) <== Memory access at offset 8951
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overflows this variable
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HINT: this may be a false positive if your program uses some custom
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stack unwind mechanism, swapcontext or vfork
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(longjmp and C++ exceptions *are* supported)
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SUMMARY: AddressSanitizer: bad-free (/usr/lib64/libasan.so.5+0x10a1e7)
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in __interceptor_free
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==11846==ABORTING
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Fixes: bf7f48f4c7dc ("mount.cifs.c: fix memory leaks in main func")
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Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
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---
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mount.cifs.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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diff --git a/mount.cifs.c b/mount.cifs.c
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index 7748d54aa814..0c38adcd99b1 100644
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--- a/mount.cifs.c
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+++ b/mount.cifs.c
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@@ -1893,7 +1893,7 @@ acquire_mountpoint(char **mountpointp)
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int rc, dacrc;
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uid_t realuid, oldfsuid;
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gid_t oldfsgid;
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- char *mountpoint;
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+ char *mountpoint = NULL;
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/*
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* Acquire the necessary privileges to chdir to the mountpoint. If
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@@ -1942,9 +1942,9 @@ restore_privs:
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gid_t __attribute__((unused)) gignore = setfsgid(oldfsgid);
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}
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- if (rc) {
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- free(*mountpointp);
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- }
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+ if (rc)
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+ free(mountpoint);
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+
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return rc;
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}
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--
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2.23.0
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