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The function loopback_setup() uses xabspath() to get the loopback path.
This function allocates dynamic memory which should be freed by the
function caller.
But there are early return cases where the dynamic memory is not freed.
Besides the special cases of perror_exit(), for which the "early" free
operation is simply used to silence memory analysis tools, the
if (racy && errno == EBUSY) return 1;
branch may be a real cause of memory leak.
Fix by adding a new free() in the racy+EBUSY branch and anticipating the
existing free().
Signed-off-by: Alessio Balsini <balsini@android.com>
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The function loopback_setup(), after copying the loopback device name
with xstrncpy(), ensures the null-termination of the string by forcing
its last byte to 0.
Unfortunately, this operation:
- was probably intended to null-terminate dest instead;
- does not affect the program execution because src is free()d right
after;
- if the size of src is smaller than the offset of the written zero, it
modifies an unknown byte in the heap.
Drop the null-termination line to fix the issue: xstrcpy() automatically
null-terminates dest, or fails if the size of src is bigger than the the
requested number of bytes to copy.
Signed-off-by: Alessio Balsini <balsini@android.com>
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There's a race between LOOP_CTL_GET_FREE and LOOP_SET_FD. Work around it
by just retrying if we get EBUSY on the LOOP_SET_FD call. This is what
similar code in ChromeOS already does.
Bug: http://b/135716654
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Use /dev/block/loop* more uniformly, and teach the tests which to expect.
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Fix `losetup -f` to not fail with an error.
Add the missing \n for `losetup -f --show FILE`.
Use decimal for the device number, like the desktop losetup.
Switch to the FLAG macro.
Make the tests runnable as tests, and expand coverage a bit. With this
patch, the tests pass both with and without TEST_HOST on the desktop.
Note though that this patch is part of fixing some real-life losetup
issues, not part of the "test cleanup" I'm also looking at. losetup is
low down that list!
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Inspired by some of the small patches that have gone by recently.
Limited to only things found in `generated/help.h`, plus a wider cleanup
for the more common "milisecond" typo.
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historical accident", so fall back to check there.
Also remove an obsolete comment TODO block, check !parent for dirtree
top of tree instead of '/' in the filename, and typecast some printf
arguments for 32-bit systems.
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checking, and fix up format checking complaints.
Added out(type, value) function to stat to avoid a zillion printf typecasts.
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analysis, plus occasional tweak by me while reviewing them.
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Sigh. Implement the complex cases and you screw up the simple cases you already tested...
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TOYBOX_HELP controlling infrastructure.
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LOOP_SET_CAPACITY. Substitute constants so they can get the rest of losetup without a build break.
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if (file) ffd = open(); at end of of function: if (file) close(ffd); "file" is an argument to the function and nothing else assigns to it. gcc warning on that close, "ffd may be used uninitialized!" _HOW_?)
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other places that were setting it that no longer need to.
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