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Description of problem:
I hit a segfault when deleting a subvolume with very long name(>4096),
it's because cmd_subvol_delete() calls strdup() and passes NULL as
argument, which is returned by realpath(3).
I used the following script to reproduce
#!/bin/bash
mnt=$1
i=1
path=$mnt/subvol_$i
# Create very deep subvolumes
while btrfs sub create $path;do
((i++))
path="$path/subvol_$i"
done
last_vol=$(dirname $path)
dir=$(dirname $last_vol)
vol=$(basename $last_vol)
# Try to delete tha last one, this would get segfault
pushd $dir
btrfs sub delete $vol
popd
Version-Release number of selected component (if applicable):
btrfs-progs-0.20.rc1.20130917git194aa4a-1.el7
How reproducible:
always
Steps to Reproduce:
1. see description
2.
3.
Actual results:
btrfs segfaults
Expected results:
subvolume can be deleted
Additional info:
Description of problem: I hit a segfault when deleting a subvolume with very long name(>4096), it's because cmd_subvol_delete() calls strdup() and passes NULL as argument, which is returned by realpath(3). I used the following script to reproduce #!/bin/bash mnt=$1 i=1 path=$mnt/subvol_$i # Create very deep subvolumes while btrfs sub create $path;do ((i++)) path="$path/subvol_$i" done last_vol=$(dirname $path) dir=$(dirname $last_vol) vol=$(basename $last_vol) # Try to delete tha last one, this would get segfault pushd $dir btrfs sub delete $vol popd Version-Release number of selected component (if applicable): btrfs-progs-0.20.rc1.20130917git194aa4a-1.el7 How reproducible: always Steps to Reproduce: 1. see description 2. 3. Actual results: btrfs segfaults Expected results: subvolume can be deleted Additional info: