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From: Kevin Wolf <kwolf@redhat.com>
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Date: Mon, 5 Nov 2018 17:37:09 +0100
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Subject: [Qemu-devel] [PULL 01/36] block/vvfat: Fix crash when reporting
error about too many files in directory
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From: Thomas Huth <thuth@redhat.com>
When using the vvfat driver with a directory that contains too many files,
QEMU currently crashes. This can be triggered like this for example:
mkdir /tmp/vvfattest
cd /tmp/vvfattest
for ((x=3D0;x<=3D513;x++)); do mkdir $x; done
qemu-system-x86_64 -drive \
file.driver=3Dvvfat,file.dir=3D.,read-only=3Don,media=3Dcdrom
Seems like read_directory() is changing the mapping->path variable. Make
sure we use the right pointer instead.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/vvfat.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/block/vvfat.c b/block/vvfat.c
index fc41841a5c..f2e7d501cf 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -973,10 +973,10 @@ static int init_directories(BDRVVVFATState* s,
mapping =3D array_get(&(s->mapping), i);
=20
if (mapping->mode & MODE_DIRECTORY) {
+ char *path =3D mapping->path;
mapping->begin =3D cluster;
if(read_directory(s, i)) {
- error_setg(errp, "Could not read directory %s",
- mapping->path);
+ error_setg(errp, "Could not read directory %s", path);
return -1;
}
mapping =3D array_get(&(s->mapping), i);
--=20
2.19.1